As I remind everyone each year: if you haven’t already done so, it’s time to update your project schedules with non-working days for 2020. Below is a list of commonly observed national and religious holidays, and the dates they are commonly observed. If I missed an important holiday, or got the date wrong, please leave a comment below so I can make corrections. Naturally, you’ll need to confirm which holidays apply to your project team.
And here are instructions for updating the working calendar in MS Project.
| Holiday | Weekday | Celebrated |
| New Year’s Day | Wednesday | 1/1/2020 |
| Martin Luther King’s Birthday (US) | Monday | 1/20/2020 |
| Lunar New Year | Saturday | 1/25/2020 |
| Republic Day (India) | Sunday | 1/26/2020 |
| President’s Day (US) | Monday | 2/17/2020 |
| Ash Wednesday | Wednesday | 2/26/2020 |
| Holi (India) | Tuesday | 3/10/2020 |
| St. Patrick’s Day (Ireland) | Tuesday | 3/17/2020 |
| Good Friday | Friday | 4/10/2020 |
| Easter Monday (UK) | Monday | 4/13/2020 |
| Beginning of Passover | Sunday | 4/19/2020 |
| First day of Ramadan | Friday | 4/24/2020 |
| May Day (Labor Day in most countries) | Friday | 5/1/2020 |
| Early May Bank Holiday (UK) | Friday | 5/8/2020 |
| Victoria Day (Canada) | Monday | 5/18/2020 |
| Ascension Day | Thursday | 5/21/2020 |
| Eid al-Fitr | Monday | 5/25/2020 |
| Memorial Day (US) | Monday | 5/25/2020 |
| Spring Bank Holiday (UK) | Monday | 5/25/2020 |
| Shauvot | Friday | 5/29/2020 |
| King Kamehameha Day (Hawaii) | Thursday | 6/11/2020 |
| Canada Day | Wednesday | 7/1/2020 |
| Independence Day (US) | Friday | 7/3/2020 |
| Pioneer Day (Utah, US) | Friday | 7/24/2020 |
| Eid al-Adha / Festival of Sacrifice | Friday | 7/31/2020 |
| National Day (Switzerland) | Saturday | 8/1/2020 |
| Independence Day (India) | Saturday | 8/15/2020 |
| Summer Bank Holiday (UK) | Monday | 8/31/2020 |
| Labor Day (US and Canada) | Monday | 9/7/2020 |
| Rosh Hashanah | Saturday | 9/19/2020 |
| Yom Kippur | Monday | 9/28/2020 |
| National Day (China) | Thursday | 10/1/2020 |
| Mahatma Gandhi’s Birthday (India) | Friday | 10/2/2020 |
| Sukkot | Saturday | 10/3/2020 |
| Thanksgiving (Canada) | Monday | 10/12/2020 |
| Columbus Day / Indigenous People’s Day (US) | Monday | 10/12/2020 |
| Day after Thanksgiving (US) | Tuesday | 10/13/2020 |
| Dussehra (India) | Sunday | 10/25/2020 |
| Veteran’s Day (US) / Remembrance Day (Canada) | Wednesday | 11/11/2020 |
| Diwali (India) | Saturday | 11/14/2020 |
| Thanksgiving Day (US) | Thursday | 11/26/2020 |
| First day of Chanukah | Friday | 12/11/2020 |
| Christmas Eve | Thursday | 12/24/2020 |
| Christmas Day | Friday | 12/25/2020 |
| Boxing Day (UK, Canada) | Saturday | 12/26/2020 |
| Kwanzaa | Saturday | 12/26/2020 |
| New Year’s Eve | Thursday | 12/31/2020 |