The 3rd annual "Gathering For Gardner" Celebration of Mind, or G4G for short (in honor of recreational mathematician Martin Gardner) is a little over a month away and beginning to build steam. Local gatherings will be held in multiple cities around the globe.
If you're not familiar with this October celebration read more about it here:
(…and if you're not familiar with Martin Gardner, one of the very best math communicators and essayists ever, well, then, be quicketh to your library or Kindle!)
If you're on Twitter the twitter-handle for the gathering is @G4G_CoM
And here is an intro to it from the ever-creative Scott Kim:
...Wherever you are on October 21, let your inner (mathematical) child soar! ;-)