One of the best parts of attending the IPP is getting the chance to play/solve with the 60 + puzzles that are new and often one-of-a-kind. At the awards dinner, I was thrilled to discover that one of my favorites this year was designed by a good friend.
If you are interested in attending an IPP, getting an invitation is not so easy. The founders of IPP want to be very careful about who gets in. They don't want too many people. This year about 250 puzzlers from 35 countries were in attendance.
However, the smaller puzzle parties in Europe and the US are pretty much open to everybody. You will meet great people and see puzzles that are absolutely not available in any store.