Oh, I almost forgot - the Rainbow Gatherings also include mitigation, replanting and rehabilitation of the meadows where the gathering takes place. That's very organized apparently, to the point that the Forest Service actually permits thousands of folks to trample public lands in such an obvious way. People pitch in, and if its done to the FS satisfaction, probably they do a thorough job - what the FS expects. If only the quad rallies and other ORV gatherings could attempt at least as good a job as that.