Combine Calendars in one

Hey,

it is possible to combine multiple calendars into one.
Example: Calendar of Person1 and Person2 should be combined in one.
But so that you can see which entry is from which person.

You can achieve this by use of the sharing function. When shared the user who can see both calendars can choose a color-theme for each individually.

Also works with caldav on mobile devices (personaly tested for iOS 10)