I'll actually be in striking distance of Boston for Schelling Day...but too busy to do anything about it.
Related: I make a point of observing Pi Day and Tau Day each year, usually by eating pie. Tech and gaming geeks already converge on these; they seem like good candidates for rationalist holidays as well.
The Big Idea
Why Are We Doing This?
When Are We Doing This?
What Are We Doing?
Then What?