Every year, my friends & I like to mark "Pi Day" by eating pie, if at all possible. We try to make or buy pie, and sometimes attend a local annual "Pie Day" event.
"Pi," or π, you may remember, is the ratio of a circle's circumference to its diameter, which comes out to an irrational number that is roughly rounded to"3.14159265359..." so nerds like us round that out to 3-14, or March 14th.
This year is a little unusual, in that you can also include the year to make "Rounded Pi Day"--when you round Pi to 6 digits, you get 3-14-16.
We nerds will take any excuse to eat pie & make puns!