The Bach Society will present its free Christmas choral concert, “At the Manger” in December. The 30-year-old community choral group will perform Friday at Center Presbyterian Church in Slippery Rock and Saturday at Tower Presbyterian Church in Grove City. Both concerts start at 7:30 p.m.

The Sacred Music Choir, accompanied by organ, brass and strings, will perform a concert of classical Christmas anthems and carols at 7:30 p.m. Dec. 12 at St. Peter's Anglican Church, East Jefferson Street. In addition to the choral music, Clarissa Boden will play two Christmas favorites on the glass harmonica. A reception will follow the concert. Admission is free. Donations are accepted.

St. Andrew's Cross will perform “Rockin' Christmas” on the Concordia at Cabot campus in the Haven I Dining Room, 112 Marwood Road, Jefferson Township, at 7 p.m. Sunday. Call 724-352-1571, Ext. 8518.

Union High School will be the site of two concerts, one at 7 p.m. today featuring the elementary band and elementary choir. The second concert will be the annual Christmas concert featuring the junior and senior high school bands at 7 p.m. Dec. 11. Admission to both concerts is free, but donations of nonperishable food will be collected for food banks. Call 814-473-3121.

Harmony in the House presents the Early Mays at 7:30 p.m. Friday at Bottlebrush: A Gallery for the Arts, 539 Main St., Harmony. Admission is $15. Call 724-452-0539.

Allegheny RiverStone Center for the Arts will host several holiday events: A Madrigal Dinner at 7 p.m. Friday and Saturday at Lincoln Hall, 42 S. Palmer St., Foxburg, at a cost of $35; Three Rivers Ringers, a handbell ensemble, at 2 p.m. Dec. 13 at Emlenton United Methodist Church, 1303 Kerr Ave., Emlenton, at a cost of $15 for adults and $8 for students; Pittsburgh Symphony Brass at 7 p.m. Dec. 19 at Memorial Episcopal Church of Our Father, Foxburg, at a cost of $30 for adults and $10 for students. Call 724-659-3153.

Music in a Great Space will present Handel's “Messiah” by the Shadyside Chamber Choir and Chatham Baroque at 4 p.m. Saturday and “A Service of Lessons and Carols” by the Shadyside Chancel Choir at 4 p.m. Dec. 14, both at Shadyside Presbyterian Church, 5121 Westminster Place. Call 412-682-4300.