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Cognitect Support for Clojure Events


Cognitect (formerly Relevance) has run many Clojure events since 2010. The first Conj was put together for the rapidly growing Clojure community in the early days of Clojure and it became an annual event run primarily on the east coast of the US. In 2012 and 2013, Alex Miller started and ran Clojure/west as an independent event, later becoming a Cognitect event after Alex joined Cognitect. EuroClojure was created by the European Clojure community and run by Marco Abis, then transitioned into a Cognitect event in 2015.

Throughout, the goal has to been to provide places for Clojurists to gather and talk about their favorite language, provide opportunities to learn and share tools, techniques, and successful experiences. In the last few years, we've seen the rise of many great new Clojure community events in London, Berlin, Amsterdam, Helsinki, Bangalore, Leuven, Toronto, New Orleans, and some online as well.

Moving forward, Cognitect will continue to produce the Clojure/conj event on an annual basis every fall. We will discontinue the EuroClojure and Clojure/west events and increase our sponsorship of community conferences, provide speakers as desired, and offer other support as needed for worldwide Clojure community events. If you are a Clojure conference organizer, please contact with any questions or requests.

We look forward to seeing you at Clojure events wherever they happen!

Full Schedule and Speaker Lineup for Conj 2017 Announced


We are very pleased to announce the full schedule and the speaker lineup for this year's Conj. We're excited about the program: Guy Steele, Rich Hickey, Stu Halloway, Carin Meier, and many more will be helping celebrate the 10th anniversary of the launch of Clojure.

In addition to the talks, we'll have unsessions, an after-party, and this year we're introducing a pre-party and game night on Wednesday night.

We are looking forward to the program, but mostly to seeing everybody at the show. If you haven't already, you can register here. See you in October!

Come celebrate seven years of Conj, 10 years of Clojure!

In early 2010, Amit Rathore and Tim Dysinger had the idea that it was the right time for a Clojure conference. In early April of that year, Cognitect (then Relevance) reached out to offer our support. By late October, the inaugural Clojure/conj was a reality. You can relive those early days by:

That first year in Raleigh, there were 167 attendees altogether, which rose to more than 500 last year in Austin. Along the way, the Conj moved up to Washington DC for 3 years, including a stop at the beautiful George Washington Masonic Memorial Theater:

The George Washington Masonic Memorial Theater in Washington, DC, 2013.

The George Washington Masonic Memorial Theater in Washington, DC, 2013.

From there, in 2015, it moved to Philadelphia, and last year to Austin, Texas, with this year being, of course, Baltimore.

Along the way, we've had some great moments. Near and dear to our hearts this year, back in 2013 David Bock baked Clojure a 6th birthday cake, which Rich and Stu joined forces to cut:

Stu and Rich cutting the cake.

Stu and Rich cutting the cake.

In 2010, there was an after party at Tir Na Nog in Raleigh. The party was meant to be a place to unwind, chat and hang out in a relaxed atmosphere, but instead, was dominated by some excellent (and excellently loud) bagpipers:

So good, so loud.

So good, so loud.

In 2011, Sam Aaron blew everyone away with Overtone. In 2012, Dan Friedman and William Byrd gave a talk showing miniKanren for Scheme which was a major hit.

A few other personal favorites of mine:

And let's not forget the collection of talks Rich has given at the Conj:

There have been so many great speakers and talks over the years at Conj, but invariably what stands out from personal recollection and from the feedback we receive each year is how much fun is had, and how much value is gained, in the hallway track and the times between and around the talks as the community gets together. If you go back to the early days of 2010, that was the impetus that drove Amit and Tim and then us to want to see Conj come into existence - to bring as many people from the community together in one place as we could and give everyone the chance to meet and get to know their fellow travelers.

This year, as we gear up for the seventh Conj, we are also celebrating Clojure's 10th anniversary (and ClojureScript's 5th, too!). It is remarkable to think of those time scales - a decade of Clojure in the wild. Certainly, the growth of the community of developers using Clojure has been wonderful to see, and we are thrilled to mark this anniversary with everyone in Baltimore this year. In addition to all the wonderful talks, there will be special events to celebrate the anniversary, a game night event, and much more. See you there!

Clojure/west 2016

We're happy to announce that Clojure/west 2016 will be April 15-16th in Seattle, Washington. The event will take place at the Seattle Marriott Waterfront, close to Pike Place Market, the Space Needle, and other downtown Seattle attractions.

The Call for Presentations is open now and will close on Jan 29th. We would love to have your submissions and welcome any questions at Speakers receive:

  • free admission to the conference
  • hotel
  • US travel reimbursement (or $550 stipend if international). 

We are also now seeking sponsors for the 2016 event! Clojure/west is a great opportunity to reach 500 Clojure developers with hiring, products, or other developer-oriented outreach. If you're interested in being part of the event please contact us to see how we can collaborate on the best option for your team.

Early bird registration for Clojure/west will open later in January - stay tuned!

EuroClojure: June 25-26 in Barcelona

We’re pleased to announce that EuroClojure 2015 will be held June 25-26 in Barcelona, Spain. Thanks again to Marco and the Clojure community, and we’re looking forward to seeing you all there. Details including registration, sponsorship, and the call for presentations are forthcoming; you can check out or @euroclojure for updates and of course we’ll update here as well.

EuroClojure Joins the Cognitect Family of Events

EuroClojure has been a great conference for Clojure for several years - big thanks to Marco Abis and the community for all of their hard work. To ensure the continued excellence and growth of the conference, we are excited that EuroClojure has joined the Cognitect ecosystem. Marco has been helping us and will continue to help make this conference awesome and importantly to preserve the unique style of EuroClojure. We want to thank him for creating the vibrant community event it has already become. EuroClojure now joins Clojure/conj (in the fall) and Clojure/West (April 20-22, Portland, OR) in our lineup.

We’re working on an exact date and location for EuroClojure 2015, and should be able to announce that within the week so stay tuned. Marco and the Cognitect folks are all excited about this and looking forward to seeing you all this summer.

Contact us at for questions or to learn more about this.

Clojure/conj 2014: The largest yet

Clojure/conj 2014 is in the books. This was the fifth Conj and by far the biggest, with 500 attendees and 21 speakers. In fact, the conference set some new bars. It was the first time:

  • the Conj has crested 500 attendees
  • the talk videos were posted same-day
  • opportunity grants were awarded
  • more than 60% of attendees were first-timers

Since the videos have gone online at ClojureTV they have been collectively viewed more than 36,000 times. 

I'd like to extend some thanks to people who made the event such a success.  First, Lynn and Alex, for planning, organizing and staffing the event.  Next, to the speakers: it isn't easy getting up in front of that crowd, and you did it with style, and aplomb.  Third, to the sponsors, whose support made so much of the event possible. And finally, to the attendees, without whom there is no event, and no purpose.  You *are* the show. 

We hope that everyone who attended found the content and the community they were expecting and some surprises in addition. For those who weren't able to attend, you can check out the videos online, and there is always Clojure/west and next year's Conj.  We hope to see you there!

Clojure/conj Opportunity Grants

Cognitect wants to see everyone who wants to attend Conj get that opportunity. For that reason, we launched the Opportunity Grant program this year to support community members who would not be able to attend due to financial obstacles. Such obstacles can impact the makeup of the conference attendance, and often impact historically underrepresented groups the most.

This is our first year and the response has been stellar (nearly four times as many applicants as originally forecast!). Cognitect is providing tickets and travel assistance to a number of awardees already, but we're asking you, the community, to continue to help.  We need more help to cover more travel expenses to expand the awardee pool (Cognitect will cover tickets for all awardees). Individuals can already contribute via our Eventbrite page (and have done, thanks!), but we're also seeking corporate sponsorships for the program. We'd love to raise an additional $23,000 to cover the remaining applicants.

We've created the following sponsorship levels:

* Tera Sponsor: $4,000
* Giga Sponsor: $2,000
* Mega Sponsor: $1,000

If you are interested in sponsoring the Grants, drop us a line at

The Clojure community has a history of supporting its friends in need.  This goes right back to the first Conj: the community rallied together to send Anthony Grimes to that inaugural event. Chas Emerick spearheaded a campaign; Relevance provided tickets and lodging while a whole bunch of the community funded two plane tickets and miscellaneous other travel expenses.  Anthony made it to the show, and came back the following year to give a talk on Clojail.

The more of us there are at the show, the wider and stronger the community becomes and the brighter our collective future. We've done it before - let's do it again. 

Heading to Lambda Jam

Lambda Jam is a conference targeted at commercial developers using functional programming languages, in particular focusing on Clojure, Scala, Erlang, Haskell, and F#. The conference will take place in Chicago, July 22-23rd. Three Cognitects will be at the conference: Rich Hickey, Cognitect CTO, will deliver the opening keynote at the conference. Alex Miller will present a Datomic workshop, lead a jam, and help run the show. David Chelimsky will be attending. Tickets are still available

Lambda Jam's first edition took place in July 2013. The idea behind the show is that functional programming is on the rise in industry and while there are academic FP conferences and language-centric conferences, there are relatively few conferences where commercial functional programmers can meet to cross-pollinate ideas across language boundaries. (Some other notable venues are Commercial Users of Functional Programming and FP Days - both worth checking out.)

Lambda Jam was also designed to experiment with ideas for more interactive learning in a conference setting. Many programmer conferences are based on the eyes-front lecture format. As a conference organizer, this is the easiest format to use. Attendees have been trained in how it works from years of lecture-oriented classrooms. Organizers have full control over the speakers and content. Resources (room, A/V, size) are known in advance and lectures scale up well. But is the lecture format the best approach to learning? There is ample evidence that lectures are not the best format for all topics or all attendees.

Many conferences supplement lectures with longer-form workshops. Workshops give the opportunity for interactive learning over a longer time period. However, they are much more challenging on the budget. To be effective, workshops should be small. Small rooms mean more rooms, more A/V, and more speakers (speaker expenses are typically the second biggest expense category after food). Workshops are therefore usually a net negative on the budget. 

Lambda Jam is an experiment in building a conference format that balances different learning opportunities with a workable budget. Mornings are traditional lecture style. Afternoons are primarily interactive learning. Long-form workshops are available, but they also include a new concept called "jams". Jams are an attempt to combine the hands-on aspect of workshops with the scale of a lecture. 

Jams start with a problem description. Participants form groups (or may elect to work indepently). Last year, many people formed teams to experiment with a language other than the one they normally work on. Language experts offered to assist these teams and help them through the rough patches. The jam ends with a demo period where attendees share a bit of their solution (whatever they found interesting) and what they learned.

If you can't make it to Lambda Jam this year, check it out next year. Lambda Jam has also been held twice in Brisbane, Australia and may come to a location near you in the future!

Clojure/conj 2014 - Save the Date

We're delighted to announce that the 5th Annual Clojure/conj conference will take place from November 20-22, 2014 in Washington D.C. at the Warner Theatre.

Last year we sold out a month before the conference, so this year we've moved to a larger theater so more of the community can attend.