field day

US /ˈfiːld deɪ/
UK /ˈfiːld deɪ/
"field day" picture
1.

an enjoyable day spent outdoors, typically involving sports or other recreational activities

:
The school organized a field day with various games and races for the students.
We had a fantastic field day at the park, playing frisbee and having a picnic.
2.

an opportunity for a person or group to have great success or an enjoyable time, especially at someone else's expense

:
The defense lawyers had a field day with the prosecution's weak evidence.
The tabloids had a field day with the celebrity scandal.