We do not “celebrate” 9/11; we commemorate or remember it as a tragic day and a National Day of Service and Remembrance in the United States.

What actually happened on 9/11?

On September 11, 2001, terrorists from the extremist group al‑Qaeda hijacked four commercial airplanes and carried out coordinated attacks in the United States.

Two planes hit the Twin Towers of the World Trade Center in New York City, one hit the Pentagon in Virginia, and one (United Flight 93) crashed in Pennsylvania after passengers fought back.

Nearly 3,000 people were killed, including office workers, airline crews and passengers, first responders, and military and civilian personnel at the Pentagon.

The attacks deeply shocked the country and led to major changes in U.S. security, foreign policy, and everyday life.

Why do people “mark” or “observe” 9/11?

People use the date to:

  • Honor the victims who were killed in the attacks.
  • Pay respect to first responders, rescue workers, and ordinary people who showed bravery and helped others.
  • Support survivors and families who are still affected, including those with long‑term health issues.
  • Reflect on how the attacks changed the country and the world (wars in Afghanistan and Iraq, new security laws like the Patriot Act, etc.).
  • Emphasize national unity and resilience instead of hatred or fear.

So the “why” is about remembrance, respect, and reflection , not celebration.

What is Patriot Day and the National Day of Service?

Shortly after the attacks, the U.S. Congress and the president created official observances for September 11.

  • “Patriot Day” is the official name for September 11 in the U.S., set aside to remember those killed in the attacks.
  • In 2009, it was also designated as a National Day of Service and Remembrance to encourage Americans to volunteer and help their communities in honor of the victims and heroes of 9/11.

These observances are meant to turn a painful memory into a motivation to do something positive for others.

How is 9/11 observed (not celebrated)?

Typical ways people and institutions mark the day include:

  • Moments of silence at the specific times when each plane struck and each tower fell.
  • Flags flown at half‑staff on government buildings; many people also fly flags at home.
  • Memorial ceremonies at the World Trade Center site, the Pentagon Memorial, and the Flight 93 National Memorial.
  • Reading the names of victims in public ceremonies, especially in New York.
  • Community service projects, blood drives, and volunteering as part of the National Day of Service and Remembrance.

These acts are solemn and respectful, more like how people behave on a memorial day or at a funeral than a party or holiday.

Why the word “celebrate” upsets people online

On forums and social media, many Americans react strongly if someone asks “How do you celebrate 9/11?” because to them “celebrate” sounds like you’re happy about the attacks.

People often correct the wording and say that only terrorists would “celebrate” 9/11, while everyone else commemorates or remembers it.

In many cases, especially when the asker is not a native English speaker or is from another country, others will point out that it’s probably just a language mistake and that “observe” or “commemorate” are better words.

So the intense reaction is less about the question itself and more about the emotional weight the date carries in U.S. culture.

Bottom note

Information gathered from public forums or data available on the internet and portrayed here.