Tuesday was a happy holiday for those in the know.

Four-twenty, seen in date, time, page number or almost anything else is a significant number to marijuana users. It's embodied in the multitude of 420 motifs scene during Tuesday's all-day marijuana rally on Capitol Hill.

"It's the mother herb," said a woman visiting from Amsterdam. She wore a marijuana-leaf wreath, and her husband wore a matching lei.

Attendance has been estimated to be anywhere between 7,000 and 20,000 people. Robert Corry, marijuana rights lawyer, promised to defend anyone who received a ticket for smoking at the event.

Denver Police observed the event from the sidelines, and refused to comment. Whether or not anyone received a ticket for smoking that day is not known.

Medical marijuana advocate Max Montrose attended to raise awareness about bills being debated that day, and to simply enjoy the holiday. He pointed out a man speaking to a camera crew on the steps of the capitol building. "That's Richard Eisner. He was one of the first medical marijuana patients. I want to talk to him, but he's being assaulted by media."

Montrose carried a healthy marijuana plant in his backpack, and wore '420' in green marker on his cheek.