Join Mz. Rhythm and the Boston Rhythm Riders for 4 weeks of line dancing classes at Symphony Park, 6 p.m. Thursdays, hosted by the Friends of Symphony Park. Why stand on the sidelines? Get moving in these free sessions and learn basic line dancing call outs. More information below. Thanks to the Boston Rhythm Riders, The Mission Hill/Fenway Neighborhood Trust, and The Boston Cultural Council for making these classes possible.