Here's a fun game. Got to your browser bar and type in lineup.sasquatchfestival.com/band/INSERT-BAND-NAME-HERE (http://lineup.sasquatchfestival.com/band/Kendrick-lamar or lineup.sasquatchfestival.com/band/spoon for example) and you get their artist page. We know that. Insert the name of an artist who is not playing (http://lineup.sasquatchfestival.com/band/tool or lineup.sasquatchfestival.com/band/the-national for example) and you get the regular website background with a "Page Not Found" error message. Here's where it gets interesting, Try entering lineup.sasquatchfestival.com/band/my-morning-jacket and you a blank page with a redirect loop error, implying that the page exists but we can't see it. So far the only artist names I have found that return error are MMJ, flying-lotus, and jack-white. Maybe it doesn't mean anything, but I feel like it has to mean something. Hopefully someone with more technical knowledge of how websites work can shed a little more light on this.
That is indeed pretty weird. I would be really surprised to see Jack White back on the linup again, but MMJ and Flying Lotus both make a lot of sense. I also tried Dan Deacon and his name came up with that redirect error.