Yes you certainly will need to. The Little Golden Booklet is available to download approximately a week prior to the festival. It contains everything you need to know, including What To Bring, Playing Times, Maps and Directions, Campground Directories, Camping Tips, etcetera etcetera etcetera.
For more topics, have a look at the list of clickable topic links. Years of know-how and accumulated wisdom is all collected there. Golden Plains is a weekend in the country, and although it’s a temporary town for the weekend, you’ll need to devote a little time to getting stuff sorted in advance. A stitch in time saves nine.