Note:
If you made a mistake in removing the room, you can click “Restore” to reserve the room for the event again. However, after you save your changes after removing a room and return to the main calendar, you will not simply be able to open the event and restore the room. You will have to follow the steps above for “To reserve a room for an existing event.”
If you would like to reserve a different room after removing a room from an event, please see “To reserve a room for an existing event.”