WILLIAMSPORT - Williamsport Community Band will present its spring concert. 3 p.m. Williamsport High School auditorium. Free.
Men's a cappella quartet
Fourum will perform sacred and secular songs. 2 p.m. City Park bandshell, Hagerstown. Free. Call 301-739-6356.
Spring wildflower walk
THURMONT, Md. - Join a ranger at Brown's Farm trail in Owens Creek Picnic Area. Explore an easy half-mile trail that meanders through several habitats. The ranger will acquaint visitors with the flowers in bloom. 2 p.m. Catoctin Mountain Park, Owens Creek Picnic Area, Foxville-Deerfield Road. Call 301-663-9388.
Great Brunswick Train Show
BRUNSWICK, Md. - Model railroad clubs set up model train layouts throughout the town; includes N-gauge, Z-gauge, G-gauge and Lego layouts. 10 a.m. to 4 p.m. Start at Brunswick Railroad Museum, 40 W. Potomac St. $7; $4, ages younger than 12. Rail Pass includes the event and museum admission for $10; $7, ages younger than 12. Proceeds benefit Brunswick Railroad Museum.