contacts links

Moving from an Android for years I was disappointed that I could not merge in What'sApp Contacts with my other contacts. Normally, all my Google contacts, if they have a picture, then if I chat with someone on What'sApp it would show their What'sApp picture, but when they didn't have a whatsapp...

When I enter an event in my Calendar that involves people, I want to have a link to Contacts for those people. And when I am in Contacts and select a person, I want to see links to those events in Calendar which involve that person. Is it possible to create these kinds of links in Contacts and...