Mark your calendars, y’all! The Sisters of Swing will present their 22nd annual Christmas Concerts at 2 p.m. and 7 p.m. Saturday, Dec. 17, at St. John’s Episcopal Church, 5401 N. Brookline in Oklahoma City. Admission is $10 per person and benefits the Guild of St. George, a benevolent ministry of the Episcopal Churches of Oklahoma. The Back Row, an a cappella jazz group, will also perform at the event.