Fechner Day is held on October 22. International observance. This event in the third decade of the month october is annual.
International Day of the Nacho on October 21 (nachos first appeared in 1943 in Piedras Negras, a small Mexican city which is very near to the U.S. military base Fort Duncan, in Texas);
International Day of Culture for Concord and Peace on October 21 (organized by Aljabart Charitable Foundation);
Respiratory Therapists Week in Canada on October 21 (October 21 to 27);
World Ballet Day on October 23 (is an annual celebration of ballet held since 2014 in the first week of October);
Doctor's Day in Mexico on October 23 (Día del médico);
National Red Ribbon Week in USA on October 23 (is the oldest and largest drug prevention program in the nation reaching millions of young people)