With the new local Calendar, HA enables a lot of options (which could have also be made with other calendar integrations btw…)
One of them would be a new State for a Person.
Like the Geo-Location device, you could add a calendar to the person.
So for example, I create a calendar for me and my wife.
Now, I link them with our accounts.
When I have a meeting at 3:00 PM, and I am at home, the person card could show: