The ShowTime Singers will have an open house from 7:30 p.m. to 9:30 p.m. Thursday, Oct. 23, at the Linwood Center Community Room, 3421 Martha Bush Drive. The nonprofit, which features 40-plus voices in four-part harmony, has been performing at retirement communities, assisted living facilities, nursing homes, Veterans Administration hospitals and special events in the Baltimore-Washington area since 2003. All are welcome. Refreshments will be served. Information: 410-747-1208 or showtimesingers.net.