backgrounder vs press conference

backgrounder

noun
  • A briefing or document typically provided prior to a meeting or other event that gives basic details on subjects that are likely to be mentioned. 

  • A person employed to draw backgrounds for a comic or cartoon. 

  • A cattle farmer or rancher who runs a backgrounding operation. 

press conference

noun
  • A question-and-answer session with members of television, print and other media. 

How often have the words backgrounder and press conference occurred in a corpus of books? (source: Google Ngram Viewer )