[laumars]

I sometimes put personal appointments into a work calendar to avoid getting people scheduling meetings for that time (as a manager, I get a lot of people scheduling meetings on my behalf).

Usually the personal details are pretty sparse -- just containing the minimum I'd normally share in person eg "dentist", "doctors", "kids school performance" / "parents evening". These would be days where I'm technically working but organising my work hours around a personal appointment (otherwise I'd just put "annual leave" if I'm taking a full or half day off).

This would be enough to fall in line with Google's statement even though I'm technically not using work's calendar for personal appointments.