double date vs occasion

double date

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

verb
  • To go on a double date. 

occasion

noun
  • The time when something happens. 

  • Need; requirement, necessity. 

  • Something which causes something else; a cause. 

  • A reason or excuse; a motive; a persuasion. 

  • A special event or function. 

  • A particular happening; an instance or time when something occurred. 

  • An occurrence or state of affairs which causes some event or reaction; a motive or reason. 

  • A favorable opportunity; a convenient or timely chance. 

verb
  • To cause; to produce; to induce 

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