front of house vs town hall

front of house

noun
  • The part of a restaurant, theatre, business, etc. presented to the public. 

town hall

noun
  • A widely accessible meeting, particularly where the audience is allowed to interact with the speakers. 

  • A building that houses the local government offices of a town. 

  • The town council 

How often have the words front of house and town hall occurred in a corpus of books? (source: Google Ngram Viewer )