The word for today is…
commemorate (verb) – 1. To honour the memory of (a person or event, for example), especially with a ceremony.
2. To serve as a memorial to.
Source : The Free Dictionary
Etymology : When you remember something, you are mindful of it. It’s appropriate, therefore, that commemorate and other related memory-associated words (including memorable, memorial, remember, and memory itself) come from the Latin root memor, meaning “mindful.” Some distant older relatives are Old English gemimor (“well-known”), Greek merm?ra (“care”), and Sanskrit smarati (“he remembers”). English speakers have been marking the memory of important events with commemorate since the late 16th century.