Sewing Machine Day is an unofficial holiday celebrated on June 13. It is not clear why this date was selected, because none of the patents for a sewing machine was issued on June 13. However, this fact does not prevent sewing enthusiasts from celebrating.
International Albinism Awareness Day is an annual United Nations observance held on June 13. It was adopted by the UN General Assembly in 2014. The date of June 13 was chosen because on that day in 2013 the United Nations adopted its first resolution on albinism.