National Day of Service and Remembrance in United States
National Day of Service and Remembrance in United States is held on September 11. September 11 attacks-related observances. This event in the second decade of the month September is annual. 
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Patriot Day, holiday observed in the United States on September 11 to commemorate the lives of those who died in the 2001 terrorist attacks on the World Trade Center in New York City and the Pentagon in Virginia and those who perished when the hijacked United Airlines Flight 93 crashed in Pennsylvania. The September 11 attacks, a series of coordinated terrorist attacks killing 2,996 people using four aircraft hijacked by 19 members of al-Qaeda.
Attend a Patriot Day ceremony. If you live close enough to an area where you can attend a ceremony, it's one of the best ways to honor those impacted.
Similar holidays and events, festivals and interesting facts
Gibraltar National Day on September 10 (Gibraltar is a British Overseas Territory at the southern tip of the Iberian Peninsula commemorating the first sovereignty referendum in 1967);
Catalonia National Day on September 11
Day of Remembrance of Salvador Allende in Chile on September 11 (The anniversary of the 1973 military coup);
Commemoration of the mass hanging of the Saint Patrick's Battalion on September 12
Día de los Niños Héroes in Mexico on September 13 (in memory of 6 young Mexican cadets who died in the battle of September 13, 1847 during the Mexican-American War);
Beginning of the Week of Remembrance of the Farropiglia Revolution in Brazil on September 13
National Pet Memorial Day in US on September 14 (Second Sunday of September)
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