Denver Mayor Michael Hancock has some advice for Boston on …

There’s less than a month to go until recreational marijuana sales become legal in Massachusetts. More than 18 months since the state voted to legalize weed, residents and officials are approaching the long-awaited July 1 date that licensed shops can begin opening with varying levels of apprehension, excitement, and uncertainty.

Fortunately, it isn’t completely uncharted territory.

Denver Mayor Michael Hancock initially opposed Colorado’s 2012 voter referendum to legalize recreational marijuana. But after the measure passed, he came to grips with the fact that he’d have to lead his city through the transition. Now, he’s leading a group more at