If i use the Mail, there is Autocompletition for Receipients in the To-Field. Is it possible to modify the Calendar App, to do the same, so that i can use Autocompletition there also?
I could find an issue in Github about contact groups…:
maybe @georgehrke could provide further info…
No, i meant single Contacts from the Contacts App. But its strange, i have tried it today again to type the first signs of a Name from the Addressbook and today it searches automatically for Contacts in the Calendar. Thats what i want. Great, it works!
You have to type at least three characters. Maybe that was the mistake. 
@micheledimeo I am sorry but I do not have any useful info for you.
I have seen that you asked on Github and that is the best way to have feedback form the developers.
By the way, are you aware of this:
?
Very useful info @Spartachetto, I will withdraw my “bounty”: those are terms I don’t agree at all! 