World Vegetarian Day
World Vegetarian Day is held on October 1. This event in the first decade of the month October is annual. 
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It is a day of celebration established by the North American Vegetarian Society in 1977 and endorsed by the International Vegetarian Union in 1978, "To promote the joy, compassion and life-enhancing possibilities of vegetarianism."
Similar holidays and events, festivals and interesting facts
National Chewing Gum Day and National Hot Mulled Cider Day in USA on September 30
Extra Virgin Olive Oil Day on September 30 (since 2016);
International Podcast Day on September 30
World Copywriter's Day on September 30
Mud Pack Day on September 30 (The use of mud for therapeutic and beauty purposes can be traced back to the 16th century during the Renaissance);
National Coffee Day in Japan and Sri Lanka on October 1
National Pumpkin Spice Day in USA on October 1
International Coffee Day on October 1 (At a meeting on 3–7 March 2014, a decision was taken by the International Coffee Organization to launch the first official International Coffee Day in Milan as part of Expo 2015);
World Cocoa and Chocolate Day on October 1
Coffee Day in El Salvador on October 1 (Día de la caficultura);
Peruvian Cocoa and Chocolate Day on October 1
Cocoa Day in Venezuela on October 1
Balloons Around The World Day on October 1
International Gaucher Disease Day on October 1
Occupational Therapy Month and Rett Syndrome Awareness Month in Canada on October 1
Mental Illness Awareness Week and Human papilloma virus Prevention Week in Canada on October 1 (October 1 to 7);
Bipolar Awareness Day in the UK on October 1 (Held on the first Tuesday in October);
Herring Holiday in Finland on October 2
World Farm Animals Day on October 2
Tofu Day in Japan on October 2 (Tofu No Hi);
World Day for Farmed Animals on October 2
World No Alcohol Day on October 2
International Walk and Bike to School Day on October 2 (the first Wednesday in October);
Worldwide Day of Play on October 2 (is an annual event designed to encourage children and parents to turn off the television and play together, especially outdoors);
Medical Technologist's Day in Chile on October 2