Oh, i forgot to mention the fact that I have played huge LDS raves in southern California in 2004 and 2005, the event was called Genesis, and it was held at The Grove in Anaheim California, the production company was Props Productions in So Cal. Here is the link. In 2005 there was 5000 young people.
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At least in So Cal LDS people seem to enjoy electronic music and they throw there own events so that young people can meet. Other than no body was rolling it was a Rave with all the bells and whistles.
This year I will be at Together as One, and I am sure there will be LDS people there also. I don't what the big deal is. Maybe LDS people in UTAH are way stricter?