Field day
WordNet

noun


(1)   A day devoted to an outdoor social gathering
(2)   A time of unusual pleasure and success
(3)   A day for outdoor athletic competition
(4)   (military) a day for military exercises and display
WiktionaryText

Etymology


Apparently the idiom is derived from the military use. A parade is much easier than the soldiers’ usual drilling and forced exercise.

Noun



  1. A parade day.
  2. A school day for athletic events; a sports day.
  3. A day of class taken away from school for a field trip.
  4. A great time or a great deal to do.
    They went to the park and had a field day playing on the swings.
  5. A great time or a great deal to do, at somebody else's expense.
    The reporters will have a field day with a comment like that.
    The scandal was a field day for the press.
  6. Top-to-bottom all-hands cleaning.
 
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