jollity vs red letter day

jollity

noun
  • Revelry or festivity; a merry or festive gathering. 

  • Things, remarks, or characteristics which are enjoyable. 

  • The state of being jolly; jolliness, cheerfulness. 

red letter day

noun
  • A particularly significant day; a day of personal or sectarian celebration. 

  • A day marked in red on calendars; a church feast day. 

How often have the words jollity and red letter day occurred in a corpus of books? (source: Google Ngram Viewer )