field day

  1. a day devoted to military exercises and display
  2. a day of athletic events and contests
  3. ☆ a day spent in outdoor scientific study
  4. an occasion of enjoyably exciting events, extraordinary opportunity, or highly successful activity: the press had a field day with the senator's confession

See field day in American Heritage Dictionary 4

noun
  1. a. A day set aside for sports or athletic competition.
    b. An outdoor meeting, social event, or festivity.
    c. A day for military exercises, maneuvers, or display.
  2. Informal A time of great pleasure, activity, or opportunity: The media had a field day with the sensational story.

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