High schools in Anne Arundel County send their best rock band to Maryland Hall to compete in front of a packed house and pro judges. The winning band receives free studio time, radio airplay, future performance opportunities and priceless bragging rights. All proceeds go to the music departments of the top four bands with recognition for best individual musicians for each instrument. The audience selects the band with the best stage presence by Twitter voting. 5pm at Maryland Hall, Annapolis. $12: 410-757-8610; www.aabattle.com.