The International Conference on Functional Programming (ICFP) is being held in Snowbird, Utah this year on September 19-22. There's an associated Scheme workshop as well as workshops on Erlang and Haskell on September 23. I'm probably going up to the Scheme workshop if anyone's interested in a ride.
As an aside, if you're interested in Scheme, you may be interested in the Scheme MeetUp day on September 14. I'd be interested in putting one together for the Wasatch Front.