To some people, Pi Day is about mathematics. To others, it’s an excuse to eat pizza. Either way, there will be celebrations on Friday, March 14. Pi is the ratio of a circle’s circumference to its ...

California Pizza Kitchen Sign up for California Pizza ... Philly and Washington D.C., is teaming up with Mathnasium for free Pi Day celebrations. Families can book a Pi Day slime bar ...

March 14 is commonly referred to as Pi Day ... menu-priced pizza, with code "PIDAY." The offer is available for online and app orders only, according to the company. Get a free slice of pie ...