verbs
mark by some ceremony or observation
"The citizens mark the anniversary of the revolution with a march and a parade"
call to remembrance; keep alive the memory of someone or something, as in a ceremony
"We remembered the 50th anniversary of the liberation of Auschwitz"; "Remember the dead of the First World War"
be or provide a memorial to a person or an event
"This sculpture commemorates the victims of the concentration camps"; "We memorialized the Dead"