amateur hour vs gong show

amateur hour

noun
  • An event, particularly on radio or television, showcasing the talents of amateur performers. 

  • A situation or activity in which the participants show a lack of skill, sound judgment, or professionalism. 

gong show

noun
  • An event that proves to be a disaster, often in a fun or memorable way. 

How often have the words amateur hour and gong show occurred in a corpus of books? (source: Google Ngram Viewer )