You are receiving this mail because you seem likely to be interested in signing on for wacky and questionable enterprises. Improv Everywhere is a group that does stunts/pranks/performance art in public places in New York, like staging a repeating time loop in starbucks. See their mission page: http://www.improveverywhere.com/missions.php . I recommend starting with Moebius and Slo-Mo Home Depot.
Chapters are springing up in other cities, and there are some people interested in starting up one for Vancouver. There is a board that you can sign on to in order to get more info here: http://www.improveverywhere.com/mb/index.php
If you are interested, and also if you know people who might be interested, a meetup is being organized for Saturday Oct 21st at the Starbucks in Station Square BBY near the Red Robin at 2pm.