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DENVER — Denver’s annual 4/20 rally at Civic Center Park has been rescheduled for May 21, it was announced Tuesday.

The rally was scheduled for April 16, the Saturday before April 20, but it was postponed because of a snowstorm, “circumstances and other issues beyond our control,” organizer Miguel Lopez said.

Tens of thousands of people were expected to attend the event, dubbed the largest free celebration of culture and legalization of marijuana anywhere.

The event began seven years ago as a giant marijuana smokeout but has since evolved into a multimillion-dollar vendor and concert event.

Lil Wayne and Wiz Khalifa, who were scheduled to be at the original rally, will perform at the rescheduled event, according to the Denver 4/20 rally website.

Thousands of people converged on Denver’s Civic Center Park on April 20, though it was not as large as years past.