cessation vs happening

cessation

noun
  • A ceasing or discontinuance, for example of an action, whether temporary or final. 

happening

noun
  • Something that happens. 

  • A spontaneous or improvised event, especially one that involves audience participation. 

adj
  • Trendy, up-to-the-minute. 

  • Busy, lively; vibrant, dynamic; fashionable. 

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