Celebration

Noun

1. The formal performance of a solemn rite, such as Christian sacrament.

   "We will attend the Christmas celebration in church."

2. The observance of a holiday or feast day, as by solemnities.
3. The act, process of showing appreciation, gratitude and/or remembrance, notably as a social event.

   "She jumped in the air in celebration."

4. A social gathering for entertainment and fun; a party.

   "We are having a celebration at McDonald's for my dad's new job."