BIG HEAD TODD AND THE MONSTERS have been making solid rock ’n’ roll for some two decades now, having first gained national attention around 1993 with a string of radio singles including “Bittersweet,” “Broken Hearted Savior” and “Circle.” Saturday’s show at Port City Music Hall is a 21-and-older affair, with the Adam Ezra Group opening.

WHEN: 8 p.m. Saturday

WHERE: Port City Music Hall, 504 Congress St.,Portland.

HOW MUCH: $20 in advance; $25 day of show; $40 VIP.