conventicle vs meeting of the minds

conventicle

noun
  • The place where such a meeting is held. 

  • A secret, unauthorized or illegal religious meeting. 

  • A Quaker meetinghouse. 

verb
  • To hold a secret, unauthorized or illegal religious meeting. 

meeting of the minds

noun
  • An agreement, especially one resulting from a gathering in which discussion or negotiation took place. 

How often have the words conventicle and meeting of the minds occurred in a corpus of books? (source: Google Ngram Viewer )