DENVER (CBS4) - Hundreds of people lined up for their chance to get their hands on food from a Shake Shack pop-up restaurant in Denver.

The popular burger chain isn't expected to open a permanent location until later this year at 30th and Larimer Streets.

Saturday's pop-up event was held at The Source on Brighton Boulevard in the River North Art District.

The doors were set to open at 11:30 a.m., but organizers opened earlier because of the large crowds.

Fans had to RSVP to the event for a chance to get inside.

The restaurant will feature the restaurant's signature 100 percent all-natural Angus beef burgers, crinkle-cut fries and fresh frozen custard.