As many as 1,000 people lit up at Civic Center park as part of the 420 celebration.
Each April 20th, pot advocates rally against marijuana laws.
"420" is stoner code for smoking weed.
In Denver yesterday, police report busting just one person.
Police spokesman Sonny Jackson says officers were on-hand to ensure public safety, but mostly just watched.
He says the people at the pro-pot rally seemed pretty subdued.
