If you missed celebrating Pi Day, don’t despair. July 22nd is Pi Approximation Day, to honor the ancient Greek Mathemetician Archimedes who first approximated Pi as 22/7 (an even closer approximation than 3.14).
Also available for celebrating is April 25th, when the earth has traveled 1/Pi (2 radians) of its orbit around the sun, according to the Gregorian calendar.