Immaculate Conception Church in Columbia, 411 Palmer Road, will be celebrating its annual Blue Mass at 5 p.m. this Saturday, Sept. 11 to honor all first responders. This year’s Mass will be in memory of the 20th anniversary of 9/11. All first responders in attendance will process in with the priest and have reserved seating. The church asks that first responders wear their uniforms during the Mass.