Pi Day is an annual celebration commemorating the mathematical constant π (pi). Pi Day is observed on March 14 (or 3/14 in the month/day date format), since 3, 1, and 4 are the first three significant digits of π in decimal form. In 2009, the United States House of Representatives supported the designation of Pi Day.
Pi Day this year will be especially epic because the date & time will follow the sequence of pi for an exact instant: 3/14/15 at 9:26:53.5
Geocachers present at this time will have a chance at some small prizes. Drawing will be done around that time. (get it? Hah!)
Disclaimer: No purchase in the restaurant is necessary in order to attend the event.