MY SOLUTION:
I have installed and use Thunderbird 102 instead of Apple Calendar.
Everything works at one place.
So when a new event needed, i just intro it in the Thunderbird calendar (that supports Google Auth) - which is open for my email anyway.
Evernote calendar syncs - although not even so quickly... but with a moment of patience...☺️
No need to start a separate Browser with Google anymore!
May be this would be a good solution for other Mac Users...
Thx all for your help.