I have not made any steps toward making T-shirts. Sounds like a good idea if somebody wants to pick that aspect of this gathering up.
Saddlering, what kind of tent are you interested in? Like a display tent for outside, with no walls, only a roof?
For recent Savage Fests Grogel Deluxe has created some very nice items that can be purchased online at Zazzle. Shirts, mugs, more. And Gary has worked with hosts to create respective Savage Fest logo's.
http://www.zazzle.com/savage+fest+giftsIf you ask nicely maybe he will consider doing it again.