I'm in Amsterdam for 4/20. How cliche is that? And totally awesome, mind you! Only problem is that the majority of the population appears to be oblivious to the significance.
So, in case you fall in the latter category, here's the short and sweet: 4/20 is "International Pot-smoking Day," primarily celebrated in the United States (which makes it "international" in the same way that the World Series of Baseball is "international").
Of interesting note, today also happens to be Record Store Day. So, if it's your spiel, I'd highly recommend elevating yourself and then shopping for records.
For now, hope you enjoy this track by Bob Marley, who's song "Jamming" happened to claim our 4/20 spot in 2012. I sense a tradition?