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I went to one. Got there at 8pm with a friend, both of us are 20.
In front of us were these high schoolers who said they were there since 3PM. It started out as 8 of them then some how they managed to have a group of 15~ of them. They were the worst ones. Yelling all night, drinking their shitty energy drinks, pushing each other around in shopping carts and into the road.
Everyone else for the most part were normal and sane, around college age and there were a few kids that were calm.
I ran into a ton of old friends from high school, I ended up sticking around for another hour after I got the game just to catch up with them.
In the end it was enjoyable to some extent 7/10 would go again
Got about 70 streetpasses, none of them had puzzle pieces though and they couldn't do shit in Find Mii II. A lot of their Animal Crossing houses were trash too.