There's two celebrations/concerts on the same weekend. One in Bethel at the original site, the other in Watkins, put on by the original promoter (Lang). What'll be interesting is the lineups. Both sites are close enough to 17/I-86 that bands could perform both places if they are allowed to.
As for me, I was at '99 as a volunteer, wish I had gone to '94. I'm leaning towards Watkins, if I can get in as a volunteer again.