commemorative photograph;  souvenir photograph
 commemorative plaque (usu. on a stone);  stone monument (bearing an inscription)
 museum (esp. in memory of a person or event);  memorial hall
 memorial lecture;  commemorative speech
 commemorable;  worth commemorating;  momentous;  monumental
 taking a commemorative photo
 taking the entrance examination for a school without regard for one's chances of passing
 commemorative stamp;  cachet
 National Foundation Day (national holiday; February 11)
 collection of essays contributed in celebration of something;  festschrift
 commemorative publication
 commemorative publication
 commemorative coin;  memorial coin
 Nobel Memorial Prize in Economic Sciences