DENVER (CBS4)– The organizers of Denver’s annual 4/20 Rally are fighting with the city to keep hosting the event at Civic Center Park.

Trash that was left scattered across the park following this year’s rally. In a review, the City of Denver also cited noise complaints, health violations with food vendors, and security issues with the event.

(credit: CBS)

In late May, the city decided not to allow the organizers to host the rally for three years.

(credit: CBS)

An attorney for the rally is claiming that ban in unconstitutional.

(credit: CBS)