OARS, the watershed group for the Assabet, Sudbury and Concord Rivers, has a lot planned over the summer, including Water Wise Workshops for kids, a water chestnut pull in Stow on the Assabet, trail work along the Assabet River Blue & Green Trail, and “Rivers, Views & Brews” at the Medusa Brewing Company in Hudson. For dates, times, descriptions and RSVP links, read their e-newsletter here.