Creating a venue requires an Enterprise account with the Events add-on.
The Redirect setting allows you to push attendees arriving at the venue to a different URL. You can select from the drop-down menu if you want to redirect only your new attendees or all the attendees. You can even select to automate it for everyone once the doors close for the event.
A settings icon on the top right side of your screen will open the Venue settings. You can manage the Redirect settings from here for the global venue.
When you enable the Redirect button after the doors close, it will notify attendees to go to the new URL. You can also push attendees to a backup stream in case you face difficulties in your ongoing event.