When creating an event on VoiceBoxer, whether it is multilingual or monolingual, you have the possibility of allowing users to pre-register for it. You can enable this by checking the registration box during the first step of the Event Creation page:

registration on VoiceBoxer

This allows you to know who would like to attend the event and the users will have the event listed in their portal, as well as allowing them to receive email notifications regarding any changes to the date and time for it.

An example of a registration page can be seen here:

For instructions on how to advise your audiences to connect to an event with registration, please read this guide