Dead and Company take the stage at Folsom Field in Boulder on Saturday, July 2, 2016. From left, bassist Oteil Burbridge, drummer Bill Kreutzman, guitarist John Mayer, drummer Mickey Hart, and guitarist Bob Weir. Not pictured: keyboardist Jeff Chimenti.

(Hart Van Denburg/CPR News)

It's been 15 years since CU Boulder's Folsom Field last played host to a rock concert, but when Dead and Company launched into the opening chords of "Bertha" Saturday night, and tens of thousands of Dead fans began to dance and sing as only they can, it felt as if the music had never stopped.

We're talking Dead Head, tie dye heaven here. Veteran fans with gray hair or no hair at all happily gyrated and sang along with folks young enough to be their grandchildren, all under clear skies and a hazy cloud of marijuana smoke as the sun set behind the nearby Flatirons.

Three original members of the Grateful Dead now form the backbone of Dead and Company: guitarist Bob Weir and drummers Bill Kreutzman and Mickey Hart. Along with guitarist John Mayer, bassist Otiel Burbridge and keyboardist Jeff Chimenti, they charged through parts of a Dead catalog that spans 50 years before the lights came up at 10:45 p.m.

Dave Mathews Band was the last concert at Folsom Field, and proved to be the straw that broke the community's back of tolerance for broken stage curfews, noise and rowdy behavior. But before and after the Dead show, as fans swarmed over University Hill and the campus, the scene was peaceful and police generally stayed in the background

Here's a few photos from before and during the show, and a video clip from the opening of the second set "Scarlet Begonias" and "Fire on the Mountain."

Dressed for the occasion, a Dead fan waits for the band to take the stage at Folsom Field Saturday, July 2, 2016.

(Hart Van Denburg/CPR News)

Dead fans dancing on University Hill Saturday, July 2, 2016.

(Hart Van Denburg/CPR News)

Many in Boulder embraced the return of live music at Folsom Field. On the Hill, eateries like The Sink welcomed Dead and Company on July 2, 2016.

(Hart Van Denburg/CPR News)

Outside Owsley's Golden Road in Boulder on Saturday, July 2, 2016.

(Hart Van Denburg/CPR News)

The scene outside Owsley's Golden Road in Boulder, Saturday July 2, 2016. 

(Hart Van Denburg/CPR News)

On the Hill in Boulder, Saturday, July 2 2016.

(Hart Van Denburg/CPR News)

Tailgating before the Dead and Company show on Saturday, July 2, 2016. 

(CPR News/Hart Van Denburg)

Hoping for a ticket to the Dead and Company show in Boulder on Saturday, July 2, 2016.

(Hart Van Denburg/CPR News)

A panorama of Folsom Field between sets for Dead and Company on Saturday, July 2, 2016.

(Hart Van Denburg/CPR News)

Dancing to the Dead during "Tennessee Jed," Saturday, July 2, 2016, at Folsom Field at the University of Colorado, Boulder.

(Hart Van Denburg/CPR News)