We're going to have a hack night.
The 99 Problems Series is a programming challenge that challenges a developer to solve problems using lists, logic, trees, and graphs. Fellow F#er Cesar Mendoza has taken the time to code and solve most of these problems for us. They are available here: http://www.fssnip.net/tags/ninety-nine+f%23+problems
Bring your laptops and sense of camaraderie, because we're going to spend some of the time working through some of the problems as individuals/pairs and some of the problems as a group.