Commemorate
Part of speech: verb
Definition: To honour the memory of someone or something with a ceremony. To serve as a memorial to someone or something.
Example sentence: My intention still is to write a play to commemorate, possibly rather skeptically, the 50th anniversary of the Russian revolution. I started it at the beginning of 1966, but confronted with the enormous importance and reality of that revolution, I absolutely boggle. I don't know what to do about it.
Memorialise
Part of speech: verb
Definition: To provide a memorial for someone; to commemorate