On this day, October 21, in Ukraine and around the World:
International Observances and Commemorative Dates:
World Iodine Deficiency Disorders Prevention Day (World IDD Day) — observed to draw attention to the problem of iodine deficiency and its consequences.
World Day Against Pain.
International Archaeology Day.
International Day of the Nacho.
Paper and Pulp Industry Workers' Day.
Celebration of the Mind Day.
Church Dates (according to the New Calendar in Ukrainian Orthodoxy):
Venerable Hilarion the Great. In folk tradition, this day is known as Hilarion's Day or the Day of Autumn Winds.