Commemoration is an event or activity that is held to honor a person, event, or milestone. CEREMONY is an event that is usually formal and involves rituals or traditions, such as a wedding or graduation. FESTIVITY is a joyous CELEBRATION, often with music, dancing, and food. REVELRY is a noisy, lively CELEBRATION, usually involving drinking and dancing. MEMORIAL is an event or activity that is held to remember and honor a person or event. CELEBRATION is a joyful occasion, usually involving activities such as parties, parades, and fireworks. All of these activities are forms of commemoration that can be used to honor and remember people, events, and milestones.