I only have this and last year's bashes to compare, but I thought this year's bash was phenomenal... I didn't win a thing, and I really enjoyed it(the bash, not the losing). The crossword puzzles were fun although I only managed to complete the first. I looked forward to the trivia everyday, and I enjoyed seeing the prizes that were won by others. I thought the auctions were really fun, and I'm convinced that Ed could sell ice water to eskimos(and convince them to get a set of IAP glasses to hold it).
I agree with a few previous posters about potentially posting the pen contests rules before the bash begins. I generally have very little time for turning, so being able to plan and brainstorm ahead of time would increase the likelihood of me(and perhaps others) entering a pen into one of the contests.
For newbies, a sticky on the front page outlining the various contests might elicit more participation... Sort of like the itinerary/outline that you get when you go to a business meeting or conference.
The prizes donated this year were above and beyond anything I might have expected. I hope others will join me in supporting those sponsors with our business throughout the year. When you place an order, it wouldn't hurt to add a little note saying, "Thanks for sponsoring the IAP birthday bash."
Thanks to the organizers for taking the time to do what you do... It's appreciated.