celebration vs christening

celebration

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

  • The observance of a holiday or feast day, as by solemnities. 

  • The act, process of showing appreciation, gratitude and/or remembrance, notably as a social event. 

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

christening

noun
  • Any instance of someone's or something's being christened. 

  • The Christian sacrament at which someone, usually a child, is baptized and given a Christian name. 

How often have the words celebration and christening occurred in a corpus of books? (source: Google Ngram Viewer )