As far as I know you can register at documentation in Galway.Below are the sites for the ITC and Galway international but neither of them have info about registration.In fact the ITC site still has last years info on it.
There are contact details on both sites though so you should be able to find out something from there.
I checked the entry form for Galway but there is nowhere to state which championships(if any) you are competing on.
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