Lots of music, sacred and celebratory, will fill our halls in the coming weeks. And there’s, of course, a performance of Handel’s “Messiah” which will be performed by thechoir, soloists and chamber orchestra of the St. Luke’s Episcopal Church. It’s free and open to all.(Dec. 8 at 3 p.m.; St. Luke’s Episcopal Church, 11 Saint Lukes Lane, 78209; 210-828-6425;www.slecsa.org) The …