Holidays and Observances
Alphabetical Listing of O Holidays

Below, you can find a Holidays and Observances Alphabetical Listing of US Holidays and World Holidays and Observances that start with O.  We are still adding names to the list, so more information will be coming. 

After we complete the summary pages on the site, we will start working on a detailed page(s) for each Holidays and Observance. Once a page is completed for each Holiday or Observance, it will be linked up below, as well as it's related Daily Holidays page. (that should keep us busy for the next 20 years or so!!)

Search for Holidays Alphabetically:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, N-Pg2 O, P, Q, R, S, T, U, V, W, X-Y-Z


Organic Harvest Month is the Entire Month of September!

Organic Harvest Month is the Entire Month of September! I've been growing my own Organic Vegetables over the last couple of years. Not only does it save a lot of money, but there is nothing better than going outside to pick stuff for dinner! This was one day's haul - with this many tomatoes, I took off the skins and ran everything through my juicer.  I was then able to freeze the juice/pulp in freezer quart size bags which are perfect for taking out to make pasta sauce or any type of soup. For excess zucchini - I peeled them and just grated them and put in freezer baggies to add to soups and sauces.


O Holidays and Observances

  • O. Henry Pun-Off Day - May 15, 2020 (Third Saturday in May)
  • Oatmeal Monday - February 10, 2020 (Second Monday in February)
  • Oatmeal Month - January
  • Occult Day - November 18
  • Occupational Safety and Health Professionals Day - May 9
  • Occupational Therapy Day - October 27
  • Occupational Therapy Month - April
  • Odd Day - (Last one was 9-11-13 - three consecutive odd numbers)
  • Office Chocolate Day - October 20
  • Official Lost & Found Day - December 11, 2020 (Second Friday in December)
  • Oklahoma City Bombing Commemoration Day - April 19
  • Okra Month - June
  • Oktoberfest - September 19, 2020 - October 4, 2020 Beer Festival in Munich, Germany. This festival is now held all over the World. Also, check out our Holidays in Germany page!
  • Old Clem's Night - November 23
  • Old Farmers Day - October 12
  • Old Time Fiddlers Week - June 22-27, 2020 (Third Week in June)
  • Old Time Player Piano Weekend - May 23-25, 2020 (Memorial Day Weekend)
  • Older Americans Mental Health Week - May 24-30, 2020 
  • Older Americans Month - May
  • One Day Without Shoes Day - May 10, 2020
  • One-on-One Month - September
  • Open that Bottle Night - February 29, 2020 (Last Saturday in February)
  • Operating Room Nurse Awareness Week - Third Week of November
  • Operating Room Nurse Day - November 14
  • Operation Red Wings Observance - June 28
  • Operation Safe Driver Week - July 12-18, 2020
  • Operation Santa Paws - December
  • Oral, Head and Neck Cancer Awareness Week - April 13-19, 2020
  • Orange Month - August
  • Orange Shirt Day - September 30
  • Organic Harvest Month - September
  • Organize Your Home Office Day - March 10, 2020 (Second Tuesday in March)
  • Organize Your Medical Information Month - October
  • Origami Day - November 11
  • Orphan Sunday - November 8, 2020 (Second Sunday in November)
  • Orthodox Easter Monday - April 20, 2020 
  • Orthodox Forgiveness Sunday - March 1, 2020
  • Orthodox Green Monday - March 2, 2020
  • Orthodox Holy Week - April 12-18, 2020
  • Orthodox Lent - March 2 - April 18, 2020
  • Ostara - March 19, 2020 (Spring Equinox) 
  • Osteoporosis Prevention Month - May
  • Own Business Day - October 13, 2020 (Second Tuesday in October)


Search for Holidays Alphabetically:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, N-Pg2 O, P, Q, R, S, T, U, V, W, X-Y-Z


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We are currently working on updating all 2021 moveable Holidays and Observances

Holidays and Observances Holiday Calendar

Holiday Calendar

2021 Holidays
(working on 2021 Movable Dates)


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