Petaluma United Church of Christ hosts a summer choral sing-a-long, Midsummer Night Sings, at 7 p.m. July 10 at the church, 825 Middlefield Drive. The concert conductors are David Irvine, Boyd Jarrell, Magen Solomon and Robert Worth. Tickets are $8 to $13. For details, call 763-2454 or (814) 914-2224.