remembrance (noun) – the act of remembering a person, place, or event; an act of recalling to mind; recalling a specific memory.

This coming Wednesday is September 11, 2019.

September 11, 2001 revealed heroism in ordinary people who might have gone through their lives never called upon to demonstrate the extent of their courage. – Geraldine Brooks

In 2001, Congress declared September 11 as the “National Day of Service and Remembrance”.