ovation vs red letter day

ovation

noun
  • A (ceremony for the) recognition of some achievement. 

  • Prolonged enthusiastic applause. 

  • A victory ceremony of less importance than a triumph. 

verb
  • To give (someone) an ovation (prolonged enthusiastic applause). 

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 ovation and red letter day occurred in a corpus of books? (source: Google Ngram Viewer )