4/20 deals: These Massachusetts cannabis dispensaries are celebrating with events, specials and more MassLive.com 4 hrs ago Tom Matthews, masslive.com There’s one day in the month of April that is beloved by cannabis consumers everywhere — the 20th. As legend puts it, the significance of the date has a storied history dating back to the 70′s when a group of high schoolers banded together to search for an abandoned cannabis crop in San Rafael, California. They routinely met at 4:20 p.m. and the time and date have since become recognized as cannabis slang for consumption of the plant. Recognizing the popularity of the date for cannabis consumers, many dispensaries will celebrate the date with events or new products. Here’s what some Mass. dispensaries have planned.