I got cought up in a similar event once at lake Mead, it was named "the take over" (based on the T-shirts participants wore), it happened about 8 years ago, my cousin his girlfriend, my girlfriend and I drove out from SoCal to have a good time and ride our personal water craft out on the lake, we got there early in the AM launched and set up our Canopy's a few feet from the water, at the time there were about 3-4 other families within sight, around 10Am all of a sudden a large crowd swarmed the place acting very disgusting, rude and loud, setting their EZ-UP's right against ours ridiculously surrounding ours all around while we sat under ours, as we just looked at each other in disbelief when all of a sudden a pair of females start to push the legs of our EZ-UP's and my cousin asked them to stop and immediately one of them started yelling as the other one called some of the males in the group we were surprised that they approached and just listened to what was going on, as we were practically surrounded and would have to walk trough theire set up (literally they set up EZ-UP's right against ours on all four sides) we opted to pack up and leave, and yes we were pissed yet very, very out numbered.