potluck vs tea party

potluck

noun
  • A shared meal consisting of whatever guests have brought (sometimes without prior arrangement); a potlatch; also, a dish of food brought to such a meal. 

  • Whatever is available in a particular situation. 

verb
  • To take part in a potluck, where each participant brings a meal to be shared by all. 

tea party

noun
  • A semi-formal afternoon social gathering at which tea, sandwiches and cakes are served. 

  • An interaction characterized by a high degree of courtesy, delicacy, deference, and avoidance of conflict. 

  • A type of imaginative playing in which children gather with each other or their dolls to mimic having a real tea party or other formal meal, often without any food at all. 

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