Harmony Museum on Mercer Street in Harmony will host German buffet dinners April 18 in Stewart Hall. Cost is $15 per person, and all proceeds benefit the museum. For required prepaid reservations for either of two sittings, at 4:30 or 6:30 p.m., call the museum office at 724-452-7341.

<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, hosts the traveling exhibit "Exploring Trees Inside and Out" through May 17. Regular museum hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $9 for children 2 to 18 and senior citizens and $10 for adults. Children younger than 2 are admitted free. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org.