It’s been a few years since we wrote about Pi, but we wouldn’t possibly skip the once in a century shout out to the famous irrational number when the numbers line up for a full 10 digits: 3/14/15 at 9:26:53 (AM or PM!) Add that it’s Albert Einstein’s birthday and we have a mathematical wow factor that can’t be missed.

Scientific American offers some great suggestions on how to celebrate, and where.

If there was ever a year to commemorate Pi Day in a big way, this is it. The date of this Saturday—3/14/15—gives us not just the first three digits (as in most years) but the first five digits of pi, the famous irrational number 3.14159265359… that expresses the ratio of a circle’s circumference to its diameter…

Science museums around the country are also planning live events. 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. Other festivities are being held at Exploratorium in San Francisco, the Air Force Research Laboratory in Dayton, Ohio, Princeton University (which is having a pie-eating contest, among other activities) and the National Cryptologic Museum near Washington, D.C., among many more.