Motorhead and Bad Brains -- out. Hatebreed and many more -- in. Riot Fest, set to unfold the weekend of Sept. 13-15 in Chicago, has lost a few metal participants but has gained some quality hard rock acts at the same time.

Motorhead have postponed their touring plans for now while frontman and bassist Lemmy Kilmister deals with his health issues. Bad Brains and Attack Attack! also had to drop off due to "unforeseen circumstances," according to a Facebook post by the powers-that-be at Riot Fest, while Hatebreed, Andrew W.K., Suicidal Tendencies, Joan Jett & the Blackhearts and T.S.O.L. have all been added to slots on the three-day bill.

Daily schedules and single-day tickets will be released at 10AM CT on Wednesday, July 24. So if you plan on attending, mark your calendar so you can digest all that information and start planning ahead.

The three-day passes are nearly sold out, proving that this is one event that fans of multiple-day, eclectic festivals won't want to miss.