Irrational Exuberance: How Will You Celebrate the Pi Day of the Century?
SCIENTIFIC AMERICAN, MARCH 12, 2015

“Pi fans can celebrate this weekend with a wealth of math- (and baked goods–) related opportunities. … The National Museum of Mathematics in New York City, for example, will gather people in Madison Square Park to light up a circle around the central fountain and compare its circumference with the distance across it—accompanied by free hot chocolate and pie. “