noun (n)

• a joyful occasion for special festivities to mark some happy event(noun.event)

  Synonym:
  jubilation
  

  source: wordnet30
• any joyous diversion(noun.act)

  Synonym:
  festivity
  

  source: wordnet30
• the public performance of a sacrament or solemn ceremony with all appropriate ritual(noun.act)

  Example:
  The celebration of marriage.
  

  Synonym:
  solemnisation, solemnization
  

  source: wordnet30
• The act, process, or time of celebrating.(noun)

  source: webster1913