You will need to upgrade to VBS PRO Premium in order to create a wait list for you Event. Find out more here.
To create a waiting list for your event you will need to create a MULTI-SESSION EVENT.
-When setting up your event click on ADD ANOTHER SESSION before you build your event
-Name your second session "Waiting List"
-Set the Dates and times for your Waiting list as the same time as your event
-Set the Registration Opens on dates and times for your Waiting List
**Note: If you do not want a waiting list for volunteers set both Volunteer Registration dates in that past**
-Now when someone goes to register for your event they will be able to choose the Waiting List if your other session is full!