BeforeSurveyPage
From LimeSurvey Manual
Hint: This features is available starting in version 2.05 build 140109
When
This event is fired just before the survey (during runtime) is displayed on screen. It is fired before any HTML is echoed, so don't echo anything here.
Input
The event receives the following information:
surveyId the id of the current survey
Possible output
The following information can be set in the event:
template The name of the template to use