Events in Longmont,, Colorado

1 upcoming listings — live music, theater, markets, drag, comedy and more, each with a time, a venue and a street address.

What's coming up

• Hiss-terical Haunting Cat Show 2026
  Sat 31 Oct 2026, 9:00 AM — Festival
  Boulder County Fairgrounds · 9595 Nelson Rd, Longmont,, CO 80501

Listings are seeded from venue and organiser calendars. See them on the map.