1st clip in order of appearance:
0:00 J.J. (left) vs ?
4:07 Infernal Noise Brigade (Seattle based marching band)

2nd clip in order of appearance:
0:00 Jackass (yellow helmet)
0:11 Hans Eric (right) vs ?
2:40 Captain Andy (left) vs Mez
6:50 Amani (left) vs Krista

Arson Island Resort was a huge camp of around 250 people mostly from Seattle, with some San Franciscans thrown in for good measure.

This footage is from Burning Man 2002