9/11 Day is observed on September 11. 2021. The holiday was created in 2002 by the David Paine and Jay Winuk to honor the victims and heroes of 9/11. Today it is the larges charitable engagement in the USA and is observed in about 150 countries. To celebrate 9/11 Day and contribute to this event you can perform good deeds in your area or wherever help is needed.
9/11 stands for the terrorist attacks on 11 September 2001. Where members of the Islamist terrorist organization Al-Qaeda hijacked four planes and flew them into civil and military buildings in suicide attacks.