Home teams don't matter in youth semis. They play them at the same ground regardless of who makes it or who doesn't.
Certain grounds get more use over the years than others. Magic, Darling St, Edgy and Weston are regular hosts. I'm sure it is about ground quality...
As for the times, I would guess that it is to accommodate the travelling of the Mid and North Coast teams and to allow fro extra time and pens (if required)
