Which of the following cannot be imported into the EventCenter?

Surveys cannot be imported into the EventCenter because they are typically created and managed within the platform itself, rather than being pre-defined or established as external content ready for import. In contrast, sessions, attendee lists, and speakers can all be imported as they often come from external sources such as spreadsheets or databases where the relevant data is initially collected. This feature allows event organizers to efficiently transfer large sets of data into the EventCenter, simplifying the event management process and ensuring that all relevant information is consolidated in one place.