Here are some resources for celebrating Pi Day with your students or family.
Pi song: http://pi.ytmnd.com/ (Someone put the digits of Pi to a tune, where they sing the digits!)
Numberphile has Pi-related videos: http://www.numberphile.com/pi/
Pi history/song: https://www.youtube.com/watch?v=VWGGTb5pY2U
Wesleyan has a Pi Day run (Pi miles long) that will be Saturday, March 18: https://www.nebrwesleyan.edu/undergraduate/majors-and-minors/math/pi-mile-fun-run
Pi Day website: http://www.piday.org/
Wikipedia site for Pi: https://en.wikipedia.org/wiki/Pi