Hi!
I need help posting 1 calender on 3 sites!
I’m afraid our plugins aren’t designed to do this “out of the box”. It would definitely be possible to implement as a customization but you’d probably need to be fairly confident in terms of working with code.
For something like this realistically it may be best to reach out to a suitable freelance developer (though if you are interested in figuring things out for yourself and have any more specific questions we can help with we’ll be happy to point you in the right direction if we can) 🙂