Union Presbyterian Church, 5637 Street Road, Kirkwood, will host a Christmas organ concert at 6:30 p.m. on Sunday, Dec. 17. Bob Trimble will play the church's rare, restored 90-year-old United States Pipe Organ Company theater organ. The concert will include hymns and other Christmas tunes, and the audience will be invited to sing along on some of the songs.

The event is free and open to the public.