HubSpot recently introduced Appointments as an object type, but Appointments are effectively calendar events. There’s currently no way to show these in a calendar layout without using external addons that frankly don’t cover lots of the basic functions that’d be needed.
HubSpot should allow Appointment objects to be synchronised with Outlook / Google cals AND have a calendar view within HubSpot.
We created a custom object (Jobs) before Appointments existed for Engineer jobs - we’d move these to Appointments if this functionality existed.