Jul 21, 2020 — Pi Approximation Day is observed every year on July 22 all around the world. The fraction 22/7 is an approximate value of Pi, and there behind lays a specific reason why this day is observed on July 22. This day is celebrated on July 22 every year because the value of Pi is denoted by the fraction 22/7.
Ratcatcher's Day, Rat-catcher's Day or Rat Catcher's Day is celebrated on 26 June or 22 July, commemorating the myth of the Pied Piper of Hamelin. The town of Hamelin in Germany uses the June date and the term "Pied Piper Day".
Jul 22, 2020 — NATIONAL RAT CATCHER'S DAY HISTORY The day is also known as Ratcatcher's Day, Rat-catcher's Day or Rat-Catcher's Day and is sometimes celebrated on June 26. The confusion stems from the Brothers Grimm as they cite June 26, 1284, as the date the Pied Piper led the children out of the town.