Gaeron,
Congrats, i always go to this show more so than Somerset, although last year i went to both flyfishing shows Somerset and Valley Forge, i hope they keep the PA show.
If i can help ,it would be to get a tying bag or duffel maybe a small rubbermaid with holes drilled in lip so you can lock it at night also bring a small ott light they usually give you an outlet to plug into carry a small power strip and two extension cords.Don't bring too many tools, have a idea of several items you like to tie and are also good at tying,bring the necessary materials and if you want think like you are preparing for next season's fishing,tie flies to use next year ,also possibly sell too.
if you have a chance a empty foam patch to place flies into after you have tied them or a closed cell foam patch and glue several together with 3M 77 super spray glue then take a razor and straight edge cut some strips and then slit it just like the C&F boxes take strips and glue em to a nice piece of board then you have a display, or get soma contact clips from radio shack say 5-10 of them and drill a hol so you can place clip into it an display yer flies that way.
Hope this helps
Tight Wraps & Tight Lines
Rick Wallace
P.S. bring a small igloo cooler to have drinks and eats nearby the show has jack for food and what they do have is overpriced and sucks.