To call to remembrance by a special act or observance; to celebrate with honor and solemnity; to honor, as a person or event, by some act of respect or affection, intended to preserve the remembrance of the person or event; as, to commemorate the sufferings and dying love of our Savior by the sacrament of the Lord's Supper; to commemorate the Declaration of Independence by the observance of the Fourth of July.

Preserve in memory by a celebration or ceremony.

to celebrate an event or person we want to remember

mark by some ceremony or observation; "We marked the anniversary of his death"