The Action Design Network is a non-profit organization founded in December 2012, to promote the use of behavioral economics and psychology in product design. The group has quickly grown to over 10,000 members, arranging monthly events in cities across North America and as far away as Melbourne. Here's the global hub: http://www.action-design.org .
We're the Toronto chapter, called Toronto Action Design — or "TAD," for short.
(If you'd like to suggest an event topic, help with organization, or host a future TAD event, please feel free to get in touch!)