Seven Grammys are no big deal, right? Not if you’re John Mayer, who has sold more than 20 million albums worldwide. See the accomplished guitarist and pop phenomenon 7 p.m. Saturday at Chesapeake Energy Arena, 100 W. Reno Ave. Singer-songwriter Phillip Phillips will open. Tickets are $49.50-$69.50. Call 602-8700 or visit chesapeakearena.com.