http://dressu2012.com/
I'm not sure how many people here have heard of Dress U yet. A couple of you I know have. ;-)
Dress U is the east coast's answer to Costume College. It will be in Philadelphia, adjacent to a historic house. Dress U is designed to help costumers at all levels learn new tricks or about new eras.
IE; there isn't a lot of Renaissance stuff but there is a lot on how to sew, how to pattern, ect.
There are also a ton of parties!
If you have any questions, I can answer a LOT of them. I was there when this idea was thought up and now the lady heading it. And I'll be teaching at least one course...;-)
It will be in early June and in the air conditioning.