The street drum band aNova Brazil joined us last fall to help celebrate the cleanup of the Charles River two decades earlier. Here they are warming up for the Boston Revels’ equinox RiverSing last fall at the Herter Park amphitheater along the Charles River in Allston. They later fired up the procession down to the stage and performed several unbelievably complex and infectious numbers. They’re a hard act to follow, but we did it. Boston Revels hosts events throughout the year to enhance community through folk traditions.