The Maryland-National Capital Park and Planning Commission’s (M-NCPPC) parks naturalists and the Friends of Locust Grove invite park visitors, nature lovers and bird enthusiasts to celebrate spring and welcome migratory birds at “Happy Bird Day,” Saturday, May 13, 10 a.m. to 2 p.m., at Locust Grove Nature Center in Cabin John Regional Park at 7777 Democracy Boulevard, Bethesda, Maryland. Participants will enjoy live birds, guided bluebird walks, games, crafts, exhibits and more bird-related fun.