Friday, March 14th is Pi day! (3-14). If you want to get more specific 3/14 at 1:59 would be a wonderful time to wish everyone Happy Pi Day!
Here are some resources you can use with students
Where does Pi come from Lesson Plan - a lesson I used to do with my students
Pi Lesson handout - the handout for the students
http://teachpi.org/ has many great resources.
http://www.piday.org/2008/2008-pi-day-activities-for-teachers/ - good ideas and videos here.
Search for number strings inside of Pi - http://www.angio.net/pi/digits.html
Pi Day Pinterest board - http://www.pinterest.com/nctmillum/pi-day/
My Favorite Pi book - Sir Cumference and the Dragon of Pi
Learn about Pi with Max and Morty
What Pi Sounds Like