How do I link an Events place to a contact (and it's already saved adress)

How do I link an Events place to a contact (and it's already saved adress)

Hi, I am very new to zoho and I have a database of quite a few contacts with saved adresses. If I know start an Event, I would like the "Lovation" to be like "at XY", so that I dont need to find out what the correct adress of the contact is and then tiping it into the field for Location...
Is that possible somehow?

I already managed to press "relate to - contact", but that does not solve the problem because the field for Location stays empty...

My goal in the end is that my iOS Calendar tells me "you have an event in 1 hour" and me (in the car) only has to tell Siri to navigate me to the events location. That already works fine if I add an event on my iphone and for location I use a contact from my iphone-contacts...