π -Day is observed on March 14, because of the Ancient Greek mathematician Archimedes' first rough approximation of π as being 3.14. There is a large variety of ways of celebrating Pi Day and most of them include eating pie and discussing the relevance of π. The first π Day celebration was held at the San Francisco in 1988.
This is a popular MBAMP workshop. Schools and districts can schedule it. Contact Judith Montgomery MBAMP Director firstname.lastname@example.org if you want to know "How to have a Pi Day".