Much like when inside a Space, over on the left is a ‘+Add’ button under the ‘Stages & Rooms’ tab.

In fresh events you’ll have the option to populate with Rooms & Stages from the homepage of the event — or they’ll be some made automatically if you’ve chosen to use a template.

You’ll need to specify how long you want these Rooms to be open, and when you want them to be functioning — this will fit into your overall structure of the Event.

Don't forget to invite people to the Event so they can use the Room. Nobody likes an empty Room.