Mayor Marty Walsh has invited Grammy- nominated Boston Baroque to perform its sixth annual Free Community Concert at the Strand Theatre in Dorchester. Ring in the New Year with family and friends and enjoy Bach's sparkling "Brandenburg Concerto No. 4" and Vivaldi's "Violin Concerto," performed with virtuosic flair by Boston Baroque concertmaster Christina Day Martinson. Families are welcome! The event is free, but tickets are required.