convention vs pep rally

convention

noun
  • A meeting or gathering. 

  • A formal agreement, contract, rule, or pact. 

  • A treaty or supplement to such. 

  • A practice or procedure widely observed in a group, especially to facilitate social interaction; a custom. 

  • The convening of a formal meeting. 

  • A formal deliberative assembly of mandated delegates. 

pep rally

noun
  • A meeting or gathering for the purpose of instilling enthusiasm and motivation in attenders. 

  • An extracurricular school activity in which students gather to express support for the school sports team before a game. 

How often have the words convention and pep rally occurred in a corpus of books? (source: Google Ngram Viewer )