I know a fair few come to BV by train, and looking at National rail enquiries, there dosnt seem to be any trains from Picadilly to BV tomorow afternoon, for some reason.
You will have to get a bus service 204 from Manchester, Piccadilly/Newton Street (Stop EO) to Hyde road (stop H), its an 18 min journey and maybe plan your journey a bit earlier.
Cheers Wildy