Monster Bash, the international classic monster movie conference and film festival, is Friday through Sunday at the DoubleTree by Hilton Hotel Pittsburgh-Cranberry, 910 Sheraton Drive, Marshall Township, Allegheny County. Hours are 9 a.m. to 2:30 a.m. Friday, 8 a.m. to 1:30 a.m. Saturday, and 10 a.m. to 5 p.m. Sunday. Admission is charged each day. Visit www.creepyclassics.com or call 724-238-4317.

The 164th Big Butler Fair runs June 28 to July 6 at the fairgrounds on Route 422, Franklin Township. It features fireworks, a midway, games, demolition derbies, truck pulls and concerts. Call 724-865-2400 or visit www.bigbutlerfair.com.Maridon Museum, 322 N. McKean St., is open 11 a.m. to 4 p.m. Wednesdays through Saturdays. Admission is $4 for adults and $3 for senior citizens and students. Call 724-282-0123.