I would have to say the most memorable was probably at one of the old sand hollow events, everyone, and I mean everyone congregated at an area for a lunch. It was fun to talk with old friends, family, etc while all sorts of people tried some fins and such in the area. It was followed by several rolls, and just a good time. IDK if this was due to being my first time ever in Sand Hollow, the crowd, the atmosphere, or all of the above, but that has stuck with me since.
I also remember going to Dump Bump/Butt Dump at the beginning of Hells during EJS, and I still go to PSH once and a while while at EJS as well, but its not the best atmosphere, so I dont usually stick around for long.
Another one was always going and walking the vendors show at EJS. Was always good talking to the vendors, grabbing stickers, etc. For some reason, even the big raffle during EJS was fun from time to time. Especially if someone in your group won something, that was always a good memory.