International Pi Day 2024 Calendar. Every month commemorates important days or events that are honoured on an international level or have national relevance. Pi approximation day is observed on july 22 (22/7 in the day/month date format), since the fraction 22⁄7 is a common approximation of π, which is accurate to two decimal places and.

International day for the remembrance of the slave trade and its abolition. This day commemorates the mathematical constant pi.