I see where you're coming from, but I'm only typing out what I saw. The page source of the line up page has the day and stage listed for every band. The "El Chupacabra" thing could just be a gimmick that doesn't translate over to the festival, but who knows, I included it because it piqued my interest as well. Also, it looks like the Maine stage will be around again this year, they have the stage listed as "Cthulu" instead, and some of the recent hip-hop additions appear to be playing on it. El Chupacabra and Cthulu fit with the mythical creature theme of the festival so I can see it happening, but it could also just mean nothing.
Here is a stage and day breakdown per the page source of sasquatchfestival.com/lineup as of February 23. This table is not an official stage listing, but it comes straight from the website. I listed artists in the order they appear on the lineup. Start worrying about conflicts accordingly!