Tom Bergeron shifts from Dancing with the Stars and America’s Funniest Home Videos to host this live PBS celebration from the National Mall in Washington, D.C. Scheduled performers include the most recent American Idol winner, Phillip Phillips (pictured), as well as Megan Hilty from Smash, Javier Colon from The Voice, and Matthew Broderick and Kelli O’Hara from Broadway’s Nice Work if You Can Get It. Check local listings.