My daughter figure skated for years, and we traveled all over the East coast...I have been to my share of shows!!
Anything with a skate on it will sell like hotcakes...you have to first decide your price point...low end or high end...there is a market for both at all shows...
Hair scrunchies always sell, as do fingertip towels(to wipe down the blades with), boot covers, blade covers, sweatshirts with a skate or skater applique would do well...I don't know what your comfort level is, or if you have any applique experience?
I made a lap quilt one year and donated for the club's 50/50 raffle, it had applique skates on it, it made a few hundred dollars for me and the club...let us know more about your skill level and what you like to do...or pm me...i'd be happy to help....Donna