The ROCKSTAR ENERGY DRINK MAYHEM FESTIVAL is all about rocking out and getting drunk on energy drinks. Featuring freak-out artist Marilyn Mason, legendary metal band Slayer, metalcore band All That Remains as well as Killswitch Engage, Cannibal Corpse and Trivium, this year's festival should have the kiddies screaming their tonsils out. For those who can't afford tickets, make sure to jump on the website and leave a funny comment about why you should be able to go to the concert – if yours is chosen as the best, you'll walk away with two free tickets. $25-$99. 1:30 p.m. Aaron's Amphitheatre at Lakewood, 2002 Lakewood Way. 800-745-3000. www.ticketmaster.com.