I also noticed the last swap was a mob scene. I agree it was due to the LONG time since the previous one. However, even the 2 before that wer crowded.
I have a few suggestions:
1. A larger room. Not huge, but say another few hundred square feet. This extra space will not be occupied, but will allow for larger aisles so that people can move more freely. Much of the problem is waiting for a "lane change"
2. Limit the vendors to selling actual fish stuff. The last two had 2 people selling jewelery trinkets! If I want that garbage, I will go to a flea market. This is a fish swap.
3. This one is tricky, since I would think that we are motivated to be family oriented. But the people with the big arse strollers are really in the way. Maybe a polite note about lack of room, foot traffic etc would help. I certainly don't want to dissuade families from coming, rather I would encourage it, but maybe a gentle note can help.
3a. Enough with the huge backpacks. You are indoors, not on a hike up Mt Everest. You can't possibly need that huge thing which every time you turn, bumps into 3 people!
4. Increase the frequency of the swaps.
Just some ideas. I really enjoy the swaps, but did find myself leaving early at the last two bacause I was tired of being bumped into by everyone.