An event in Denver celebrating cannabis culture will limit the age of festival-goers to 21 and older next year after parents complained, citing concerns about youth exposure to weed. The Mile High 420 Festival, set for Wednesday in Denver’s Civic Center park, is billed as “the largest 420 festival in the world.” With general admission tickets available for free, event organizers anticipate more than 50,000 people will attend. It’s no surprise that Colorado would attract so many pot enthusiasts. This year, Denver is considered the “best weed city” in the U.S., where the number of dispensaries – about 10 per 100,000 residents — is more than seven times the national average, according to Clever, a real estate data company. Read the rest of this story on DenverPost.com.