I want to invite you to join the Minneapolis Team for the Grails48 Hackathon that is occurring November 9-12. It's easy to join at hackathon.io: http://grails48.hackathon.io/teams/view/615
You don't have to be there the whole time -- even part of a day would be helpful.
Our project is EnlistApp. Enlist is an open source and free application that aims to help non-profits organize volunteers, track volunteer hours and management volunteer rewards. This application will directly benefit Team Ortho -- they put on running races in the Twin Cities. They support research, education, and advancements in orthopaedic technology; and to promote good muscular, skeletal, and joint health by encouraging an active lifestyle including training for and participating in amateur athletic events.
We already have a start on it here -- uses Grails, Twitter Bootstrap, JQuery, etc in case you want to check it out: https://github.com/maestrofjp/Enlist-Grails
I'm working on a location. Doug Sabers has offered ReachLocal's offices (below where we have the GUM meetings) and I'm waiting to hear back from him to confirm.
In the meantime, come join the team for the hackathon.