Rock USA is a three-day camping music festival held annually in Oshkosh, Wisconsin. Considered one of the nations largest annual events that is strictly rock and metal, the festival features a Mega Mainstage and four side stages filled with nonstop live performances. The Vendor Marketplace features over 100 local and regional vendors selling commemorative merchandise and locally made goods. Past performers include Korn, Rob Zombie, Slayer, Avenged Sevenfold, Chevelle, Van Halen, Anthrax, Godsmack and many others. More Info below.