Celebrate Ultimate Pi Day on March 14 at the Adler Planetarium with drinks, music and pie! In 2015, we get to add two more digits to the mathematical constant defined as 3.1415926 … and you can bring your friends to enjoy cash bars, Vocalo’s DJ Collective, a Nerdette panel discussion and Pi Day activities. The event is hosted by the Adler and WBEZ 91.5, and pastry and pizza shops will be offering samples of the best pie — sweet and savory — that Chicago has to offer. Choose our return voucher ticket and come back to the Adler Planetarium to view their exhibitions during public hours.