JULY 11 & 12 Eccentric pop diva Lady Gaga rides her disco stick—along with her multitude of outlandish and barely-there costumes—into town for two nights as part of her self-described “pop-electro opera” Monster Ball concert tour. No need to put on your poker face or pretend that you’re k-kinda busy. Just dance like you’re her biggest fan. Rah-rah-ah-ah-ah! Air Canada Centre, 8 p.m., $49.50 to $175; call Ticketmaster at 416-870-8000 or click here to charge.