Iam searching for an alternative calendar. Especially to share it with others.

At the moment i use Timetree, but i think it does not respect privacy at all.

I tried proton, but there the colours are not transfered. So everything is red for example.

I also thought about fossify, but i dont get how to share. To complicated.

Do you know any smooth alternatives, most likely foss.

EDIT:

To anwser the questions about sharing. I want my partner to be able to read/edit the same calender as me. So we are sharing it.

I try to avoid Google and other big tec.

For me its would not that big problem if its coming with some work. It should be easy for my partner. Otherwise i wont convince to change.

EDIT2:

I see there is no "easy" solution for me right now. So i need to invest more time to get much deeper in this total degoogle/privacy/foss thing. The problem about that is where to take the time from.

I thank everybody here for your time and your anwsers!