There are free concerts every week -- Wednesdays in Basalt River Park, Thursdays on Snowmass Mountain, and Sundays at Sundeck on Aspen Mountain. Also check out the schedule at Belly Up, a renowned music venue in Aspen.
Both Aspen and Snowmass are open during the Summer. You can either hike up or buy a Sightseeing pass to ride the Gondola up, have lunch, and take in the views!
Every Saturday in Aspen from 8:30-2:00, and every Sunday in Basalt from 10:00-2:00. https://aspenchamber.org/plan-trip/trip-highlights/aspen-saturday-market https://www.basalt.net/606/Basalt-Sunday-Market
Get an authentic Western experience by visiting a Rodeo! Every Wednesday night in Snowmass and Thursday night in Carbondale. Bring your cowboy hat! We will most likely be going to the Carbondale Rodeo on Thursday 6/20, anyone is welcome to join. www.snowmassrodeo.org carbondalerodeo.com