Let’s Go Outdoors has partnered with Friends of the Wissahickon to host Earth Day Craft & Litter Pickup. Spend part of a Saturday in the park. Bring the kids for crafts and meet new friends while helping to spruce up Stinger Square Park in South Philadelphia. Free, 1 p.m. to 3 p.m., 1400 S. 32nd St. 866-878-3595, letsgooutdoors.net