Today is all about appreciating the many blessings and the wonderful people in our lives. January 11 is International Thank You Day (ITYD), an international holiday created by Mendota, IL., native, Adrienne Sioux Koopersmith.Today is all about appreciating the many blessings and the wonderful people in our lives. January 11 is International Thank You Day (ITYD), an international holiday created by Mendota, IL., native, Adrienne Sioux Koopersmith.