closing vs opening night

closing

noun
  • In morphology, the erosion of the dilation of a set. 

  • The final procedure in a house sale, when documents are signed and recorded. 

  • The act by which something is closed. 

  • The end or conclusion of something. 

adj
  • Pertaining to the finish or ending of a series of events; occurring at the end or after all others. 

opening night

noun
  • The first event in a new venue. 

  • The first night, evening, or day, of a spectacle or show. 

How often have the words closing and opening night occurred in a corpus of books? (source: Google Ngram Viewer )