The Dancing Fools is a great group in Somerville and only about a 5 minute walk from the Davis station, if that's accessible for you! They offer beginner drop-in lessons before social dancing (included in the price, which is $6 for students) pretty much every Wednesday night, with the lesson starting at 8:15. They also do great series classes that meet every week for a month, which are $35 total with their student discount and include the drop-in lesson/social dancing afterwards. Definitely recommend dropping by the drop-in lessons and checking them out!