If you go
Gateway Arch National Park: 11 N. 4th St., St. Louis. $3 admission (nps.gov/jeff).
Fair Saint Louis: Billed as America's biggest birthday party, it returns to Gateway Arch National Park July 4, 6 and 7. The event marks the opening of the Museum at the Gateway Arch and the return of the popular Boeing Air Show. Live music includes the St. Louis Symphony Orchestra, Jason Derulo and Andy Grammer, and Martina McBride. A fireworks show is the grand finale each day. Admission is free (fairsaintlouis.org).