· The free Longmont Symphony July 4th event and concert is returning to Thompson Park in 2026 and is filled with all your favorite sounds and activities. Enjoy patriotic music, a picnic contest with prizes, kids conducting the orchestra, and the traditional cannons for the 1812 Overture! Please bring something to sit on. Visit the Longmont Symphony website for details. Learn about Longmont’s July 4th celebration. Add to calendar Google Calendar iCalendar Outlook 365 Outlook Live
