commemorate - Dictionary definition and meaning for word commemorate
come + memory(ative) remembering something and honouring it. if we forget some1 bday we ll close eyes and says please come to memory.
Focus on Memor which does mean memory and com means together so commemorate means when people recall their past great events together it can be expressed as commemorate.
focus on the first half of word commem(COMMEND)+orate.and we always COMMEND AND honour the PEOPLE who had done something great for us..