Flagstaff Festival of Science in Flagstaff
The Flagstaff Festival of Science fills ten days each fall with roughly one hundred free events, from open houses at observatories and research stations to guided hikes and hands-on demonstrations across northern Arizona. Established in 1990, it is billed as the longest continuously running, entirely free science festival in the world, drawing on Flagstaff's concentration of astronomical and scientific institutions.
Flagstaff has spent more than a century building a concentration of scientific institutions unusual for a city its size, anchored by an astronomy tradition reinforced over the twentieth century by federal research facilities and Northern Arizona University.