My brother pointed me to some Pi Day resources today on the NCTM website: Celebrate Pi Day
It’s nice to see this collection, which is a great resource for teachers to easily roll out their own Pi Day celebration. If any readers can point me to other Pi Day resources, please do: I hope to write a Pi Day page some day, with links to share.
Further Pi Day pages:
Exploratorium Pi Day
For those interested, please also see my post on Math Festival Resources.