I just stumbled across this Cannabis Calendar - looks like a growing work, but definitely quite a few interesting events on for those based in the states.
http://www.thecannabist.co/calendar/#!/
The major events in Europe this year:
https://www.zamnesia.com/blog-the-2017-calendar-of-leading-eu-world-cannabis-events-n1209
Here are some UK based events:
http://www.ccguide.org/events.php
And finally, here is a whole world of Marijuana event calendars. Wherever you are in the world, you can surely find some like minded folk here:
http://cannabis.wikia.com/wiki/Cannabis_event_lists_and_calendars
If you would like more cannabis related posts to appear on your feed, then please follow me for a mix of original content and stuff that I find out there that I think you might be interested in.