double date vs jamboree

double date

noun
  • A (romantic) date that two couples go on together. 

verb
  • To go on a double date. 

jamboree

noun
  • A boisterous or lavish celebration or party. 

  • In euchre: an undefeatable hand containing the five highest cards. 

  • A large rally of Scouts or Guides. 

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