They don't meet in the gymnasium (8,4)
I believe the answer is:
parallel bars
This might be a double definition.
'they don't' is the first definition.
The definition suggests a singular noun which matches the answer.
'meet in the gymnasium' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for parallel bars that I've seen before include "Gymnastic event and apparatus" , "Facility at gym club" , "Gymnastic discipline" , "may enable people to drink separately?" , "Gymnast's supports" .)