After the massive success that was last week’s Paid Dues Festival (over 11k in attendance), Guerilla Union has just announced their next big event, Dr. Greenthumb, Tommy Chong, and Snoop Dogg‘s Spring Gathering 2011. The Music Fest & Medical Marijuana Expo (powered by Weedmaps) will be going down on June 11th at the NOS Events Center. The day will feature performances from Snoop Dogg, Cypress Hill, Travis Barker (with Mix Master Mike), Stephen Marley, and Collie Buddz (more performers to be announced). Aside from that all-star lineup, here’s a key line to keep in mind: “Guerilla Union and Medicine and Music Project will be providing a safe and secure onsite consumption area for medical marijuana patients.” Nuff said. Pre-Sale for tickets begins tomorrow, while tickets for the general public will be on sale Saturday (find out more info at their site). OKP is giving away two pairs of tickets to the gathering to two lucky winners. All you have to do for your chance to win is sign up for our email list (you can still sign up if you’re already on the list).