You can remove a survey from an event in the following ways:
From the Surveys admin screen
In the Admin panel, click Surveys.
The Surveys admin screen appears.
Locate the survey and click the Access icon.
In the Visibility section, click Remove selection.
Click Users can only access this survey if they have the link option.
Click Save.
The survey and the event are no longer connected.
[Optional] If necessary, you can attach a new survey to the event, by editing the event on the Events admin screen.