Located in Hasselt, Belgium and spanning over 3 days (19-21), the lineup for this festival includes:
Offspring, Velvet Revolver, Papa Roach, Kelis, Roger Sanchez, Groove Armada, The Chemical Brothers, The Streets, Tiesto, Bloodhound Gang, The White Stripes, 50 Cent, Felix Da Housecat, and dozens of others.

I plan to be there Friday, August 20th and I'm meeting a bunch of 'friends' there.

Check out the Pukkelpop Website for all the details. Advance tickets are currently 50€ a day or 105€ for all 3 days. You can take the train from the Munich Hauptbahnhof to Brussels, then from Brussels take the train to Hasselt or Kiewit.