Historical eventSeptember 112011

National September 11 Memorial & Museum

A dedication ceremony is held at the United States National September 11 Memorial on the 10th anniversary of the September 11 attacks in New York City, and the memorial opens to family members.

Everything on September 11Original source

In context

When
Sunday, September 11 201115 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
21st century · 2010s
Recorded from
Wikipedia “On this day” feed

At a glance

Dates: From 2011.

What happened

A dedication ceremony is held at the United States National September 11 Memorial on the 10th anniversary of the September 11 attacks in New York City, and the memorial opens to family members.

September 11 through the years

Other entries on the same calendar day, in order.

  1. 20082008 Channel Tunnel fire
  2. 2011National September 11 Memorial & Museum
  3. 20122012 Pakistan factory fires
  4. 2012Central Intelligence Agency
  5. 2012Benghazi
  6. 2015Mecca crane collapse
  7. 2023Derna, Libya
  8. 2024Hurricane Francine
  9. 2024Soyuz MS-26
  10. 2025Jair Bolsonaro
  11. 2025Progress MS-32

Also in 2011

  • May 112011 Lorca earthquakeAn earthquake registering Mw 5.1, the worst to hit the region for more than 50 years, struck near Lorca, Spain.
  • May 11Istanbul ConventionThe Istanbul Convention is signed in Istanbul, Turkey.
  • September 15Gleision Colliery mining accidentFour miners are killed in the Gleision Colliery mining accident in the Swansea Valley, Wales.
  • September 17AdbustersAdbusters, a Canadian anti-consumerist publication, organized a protest against corporate influence on democracy at Zuccotti Park in New…
  • September 17Occupy Wall StreetOccupy Wall Street movement begins in Zuccotti Park, New York City.
  • September 182011 Sikkim earthquakeThe 2011 Sikkim earthquake is felt across northeastern India, Nepal, Bhutan, Bangladesh and southern Tibet.
  • October 20Libyan civil war (2011)First Libyan Civil War: Muammar Gaddafi, the deposed Libyan leader, was captured by rebel forces during the Battle of Sirte, and was kill…
  • October 20Libyan crisisLibyan Crisis: Rebel forces capture Libyan dictator Muammar Gaddafi and his son Mutassim in his hometown of Sirte and kill them shortly t…

Everything we record for 2011 →

Sources

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“National September 11 Memorial & Museum”, What's On This Date, https://whatsonthisdate.com/app/event/national-september-11-memorial-museum-2011-september-11, accessed October 28, 2026.

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Questions about this entry

When did National September 11 Memorial & Museum happen?

September 11 2011 — 15 years ago, on a Sunday.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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