Like some others have mentioned, I'd like to know more about patterns, drafting, modifying, etc. and it would be wonderful if one of the more experienced seamstresses could give a panel on fabrics (fibres, weaves, properties and appropriate selection) I agree that an advanced wig panel would also be great.
I'm bringing a friend with me who could do a Baroque dance workshop and she teaches other styles too. Burlesque anyone?
While I'm not a professional, I do have some training so I might be able to offer a basic stage-combat workshop for punches, slaps, kicks, hair-pulls, etc. I could also do pastie-making, which would have to be 18+ and require a fee for materials.
This will be my first Costume-Con and I'M SO EXCITED!!!