Did you know? While April 22 is officially Earth Day, from the very start, Philadelphia chose to make the celebration last longer. The first city to celebrate Earth Week, the City of Brotherly Love planned events from April 16 to 22, 1970. During that time, tens of thousands of people showed up, with the largest gatherings on Independence Mall and the Belmont Plateau. This year offers plenty of opportunities to give back by volunteering with cleanups or planting projects. Check with your favorite nature center, park or environmental group to see what they need. In the meantime, here are a few larger celebrations to take your family to this month.…