part of menu in wp admin dissapiered

HI,

after nstalling a couple of new plugins I only see the settings menu item of events mangager, even after deactivationg the plugins again.
On the frontend I still do see all events but on the backend I cannnot access the eventssection.
I also cannot create any event on the frontend “permission deniend” even so logged in as admin.

Any idea what could have happend or what I could do without loosing all events?
https://coesfeld.www-staging.de/terminkalender/

Thanks, Simone