These calendars show resource usage (conference rooms, laptops, etc.) to minimize scheduling conflicts.
If you wish to reserve a resource (conference room, laptop, multiple resources, etc.):
Reservations will take priority. If you feel your need for the resource is higher priority, discuss with the person who has the prior reservation to work it out.
As always, the calendars here are only for viewing. To add events and reserve resources, you need to go to https://calendar.google.com
Contact IT a day beforehand if you need anything IT-related for a meeting. Please submit a support ticket.