(MD) (Potomac Riverkeeper) Get ready for an epic end-of-summer celebration with RiverPalooza’s Goodbye Summer Celebration! Shenandoah Riverkeeper Mark Frondorf, Potomac Riverkeeper Dean Naujoks, and Upper Potomac Riverkeeper Brent Walls are thrilled to announce this exciting whitewater celebration on one of the most beautiful stretches of the river.