Pi Day is observed each year on March 14 (3.14). It has become traditional to eat pie as part of the celebration. I am fond of pie. Except pumpkin. Who came up with that nonsense?
These books will help you find the perfect pie for your own Pi Day bash.
A Bit of Both
Art of the Pie: a Practical Guide to Homemade Crusts, Fillings, and Life by Kate McDermott
The Pie Cookbook developed by the Williams Sonoma Test Kitchen