04/20/2012 03:31 pm ET | Updated Apr 20, 2012

Marijuana In Chicago: Laws, Busts & Buzzkillers In The City (PHOTOS)

Friday is 4/20! Do you know what that means?

While many know these numbers have an affiliation with marijuana use, its origins had been the stuff of legends until The Huffington Post's Ryan Grim hunted down the original "Waldos" behind the code.

It has certainly spread as far as Chicago, where there are open festivities Friday as well as undoubtedly many underground celebrations (possession is still illegal in Chicago and Illinois). California's Lagunitas brewery, currently developing a new plant on Chicago's South Side, is welcoming its new neighbors to try a limited-edition beer, Waldo's Special Ale, which they'll tap at 4:20 p.m. Friday at bars across Chicago.

Whether you're celebrating openly, festively toking in secret or totally bypassing 4/20 this year, it's a good excuse to bone up on the city and state's current status and recent headlines on the topic.

Check out some of Chicago's most recent marijuana-related news, and give us your take on the issue in the comments:

Pot In Chicago: A Timeline