The ACM SIGPLAN
International Conference on Functional Programming
The ICFP Programming Contest
The ICFP Programming Contest is held every year, a few months before ICFP. The winners of the contest are announced at ICFP.
The 2013 ICFP Programming Contest will run from 1700 PDT on August 8, 2013 (0000 UTC on August 9, 2013) to 1700 PDT on August 11, 2013 (0000 UTC August 12, 2013).
For more information about the programming contest, you may want to have a look at the Programming Contest's permanent homepage.