August 13 is International Lefthanders Day. This day exists in many countries around the world since 1976, when it was first observed by Lefthanders International.
The festival of Obon (or simply Bon) is one of the Japanese Buddhist custom. This festival is celebrated for three days: from August 13 to 15. Originally the festival was observed on the 15th day of the7th lunar month, but after transition to the Gregorian calendar the date of celebration is fixed.