I've requested a session at Jigsaw Renaissance for us to work on costumes for Sakura-Con. The idea is that we can help each other improve and finish up our outfits for the following weekend. While we're obviously pony-focused, the session is open to non-pony designs as well!
JR has some crafting tools (sewing machine, etc.) available, however you should bring your own materials for whatever you wish to make.