lasting, permanent
The statue is a lasting memorial to those who died in the war.

living
makeshift
a makeshift memorial marked by posters and flowers

fitting
war
national
public (esp. AmE)

build, erect, establish, put up
create
become
This ruin became a memorial for the victims of the bombing.

unveil
dedicate
the many memorials dedicated to the Korean War

hold (AmE)
They are holding a memorial for it.

commemorate sb/sth, honour/honor sb
stand
The memorial stands where the two roads meet.

ceremony, service
A memorial service was held for him in Los Angeles last year.
a memorial service for sailors drowned at sea

memorial for
a memorial for victims of the air crash

memorial of
a memorial of my husband
the national memorial of the Algerian War

memorial to
The president today unveiled a memorial to those who died in the disaster.

Memorial is used with these nouns:
ceremony, chapel, fund, inscription, lecture, park, plaque, service, stone, tablet, tribute