When the pairing is sensible
The pairing is most sensible when the event market is partly expressing a view on the same underlying that the perp tracks, and the main thing you want to remove is broad tape direction rather than the event thesis itself. In other words, the perp should offset the shared market move while leaving the event repricing logic alive.
This is more plausible for threshold or dated price events than for events whose outcome is mostly detached from the underlying's day-to-day path.