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DENVER - Tens of thousands of people are converging on downtown Denver this weekend for the first massive, legal celebration of 4/20 in Colorado.

Organizers of the 4/20 rally say they expect about 50,000 to 80,000 people both on Saturday and Sunday at Civic Center Park.

A representative from "The Green Solution" told 9NEWS they are anticipating a rush on their dispensaries in Denver and the surrounding area on Friday Saturday and Sunday. They will stay open from 9 a.m. to 7 p.m. all three days.

After gunfire at 2013's rally, organizers say they're bringing in security and a large presence of Denver Police. Police say there will be a perimeter set up inside the park. If someone is caught smoking outside this perimeter, they could face a fine of more than $100. If someone is caught with more than the legal amount - which is up to 1 ounce per person - they could be arrested and face jail time. There are security checkpoints in place to prevent violence.

Organizers are encouraging people to use public transportation. They are expecting heavy traffic and limited parking.

The 4/20 rally is just one of 47 events listed for this weekend on the Cannabist - a local website focusing on marijuana issues. Another large gathering is the Cannabis Cup at the Denver Merchandize Mart. Organizers are expecting 30,000 people there.

(KUSA-TV © 2014 Multimedia Holdings Corporation)

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