I'm trying to achieve the following thing:
I have a calendar "Events". When creating an event, i. e. "Event A" I want a workflow to start, which creates a list "Attendees for Event A". Also in one column there should then be a link to that attendees list. So for every event a seperate list should be created and linked.

I think I read that this is achievable with calling a web service?

Any help is highly appreciated!