The First Baptist Church of Medford continues its winter/spring concert series with a fun and mysterious chamber music concert by the Fireside Ensemble. What's on the menu? You — the audience — will decide. Kids welcome! Fireside Ensemble is a Boston-area chamber music collective that meets you where you are: in homes, halls, and cafes. Members are Madeleine Tucker, cello; Sarah Rumbley, piano; Arjun Mudan, viola; and founder Jess Lin, violin. Free admission; suggested donation of $15, with all contributions…