Then show this call for abstracts to your Supervisor. Tell him how important this will be for your PhD and why networking in a interdisciplinary area like this is a good thing. Also tell him that you can apply to some funding for the expenses (Supervisors like that) and then pack your things.
Ah, there’s a catch to all this… you need to show us your work and therefore write an abstract so you can be selected! But that’s why you go to conferences, isn’t it?
See you in Vienna!