International Credit Union Day was established in 1948 and since then it's annually observed on the third Thursday in October.
The air traffic controllers around the world annually celebrate their own professional day on October 20. This is International Day of Air Traffic Controller, that was created to celebrate foundation anniversary of the International Federation of Air Traffic Controllers' Associations (IFATCA) in 1961.
International Chefs Day falls every year on October 20. This international observance is considered to be a professional day of all chefs around the world. The holiday was established under initiative of World Association of Chef's Societies in 2004.
World Osteoporosis Day is annually observed on October 20. Observation of this day raises public awareness of osteoporosis and its dangers.