Presented by: The North Face, REI Foundation and The Conservation Fund Co-Host: National Park Service and Crissy Field When: Saturday, July 30 | 12:00noon-5:00pm Location: Crissy Field's Historic Airfield Address: Mason Street, San Francisco, CA Calling all Bay Area Residents! Don't miss a day of free family fun on Outdoor Nation’s ultimate, outdoor adventure playground! Highlights of Summer Fu…