The Ayer-Shirley Parent Teacher Organization will hold a superhero-themed fund-raiser Saturday in the Bull Run restaurant on Great Road, starting at 6:30 p.m. Participants are encouraged to dress as superheroes, sidekicks, or villains. The event includes a buffet dinner, raffles, and prizes for the best costumes. Tickets are $45. For more information or to buy tickets, e-mail firstname.lastname@example.org.