curtain-raiser vs first night

curtain-raiser

noun
  • In a theater, an initial play, musical performance, etc which precedes the main performance. 

  • A prelude or introduction to an activity or thing. 

first night

noun
  • The first public performance of a play or other show, normally assumed to be held in the evening. 

  • The first night after marriage. 

  • Used other than figuratively or idiomatically: see first, night. 

How often have the words curtain-raiser and first night occurred in a corpus of books? (source: Google Ngram Viewer )