For better or worse, Pi Day seems to be already fairly well established. Getting broad recognition for a second math-related holiday seems like a pretty daunting task. I also suspect that the idea of math being about "voodoo numerology" is part of a broader, preexisting stereotype. If this is the case, other math holidays may not have much of a chance gaining traction while still remaining 'true'. The best part about Pi Day is that *people pay attention to mathematics when they otherwise might not* and we have an opportunity to break some of these stereotypes.

That said, it'd be great if Pi Day had a broader focus than a single constant. I propose a **math holiday 'weekend'** around Pi Day so we can include all of mathematics in the celebrations!

*March 13.* 313 is a twin prime and a palindrome, so there are plenty of ways we could go with this, although I can't think of any specific activities. It might be fun to kick off the festivities with an organized **Trimathlon** event - that is, some sort of grand scavenger-hunting, puzzle-solving, team competition.

*March 14.* **Pi Day**. I'd like to second the recommendation of Buffon's Needle related activities for this. 

*March 15* happens to be **Leonhard Euler's birthday**. As Mensen suggests, celebrating individual mathematicians helps humanize the discipline. Perhaps a famous-mathematican costume contest? Euler's contributions in particular are another source of activities; the video game *Katamari Damacy* is a great one to do with exponential growth.