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If the event takes places in a shared place, like a conference room or a lecture hall, with bookings managed with a dedicated calendar, Event Manager will automatically book time in. More info about shared place calendar here.
Use the square mosaic icon in Gmail top right corner to access Google Calendar app.
Go in Calendar settings of the shared place calendar you want to use.
Copy the Calendar ID of the shared place.
Paste the Calendar ID into the location case of the event. Event Manager will automatically book the room for the event.