April 18, 2012 No Comments FREE Organic Milkshake at EVOS on 4/20 Stop by your local EVOS on Friday, April 20th and enjoy a FREE Organic Milkshake! Locations. FREE Organic Milkshake at EVOS on 4/20 -EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.