Access Calendar with gcalcli or terminal

Hi,
I used to run gcalcli+conky on my Linux to see my agenda from Google Calendar. Now I’d like to switch to my nextcloud calendar. Thunderbird+Android is fine already. Just the mini terminal based agenda thingy…

Any Suggestions?
Thanks a lot in advance

I guess this is an answer:
http://pythonhosted.org/caldav/

Here is a preliminary solution from my side: