i Register
In some senses, commemoration is marked as UK. Watch for register when choosing this word.
noun
The act of commemorating; an observance or celebration to honor the memory of some person or event.
commemoration ceremony
in commemoration of
That which serves the purpose of commemorating; a memorial.
The specification of individual saints in the prayers for the dead.
The great festival of the Oxford academic year, usually taking place on the third Wednesday after Trinity Sunday.