We can't call it "The Hillrally", as that's owned by The Hillrally Club
We can't call it "The Scottish Hill Rally", as that's owned by RSAC (I've asked for it a few times ;-) )
"The Scottish" was the colloquial name for the July Hill rally.... which became "The Perthshire Hill Rally" when Perthshire Council sponsored the event to the tune of several thousand pounds
"The Borders Hill Rally" was, likewise, named when Borders Council dropped a few grand our way.... and "The Borders" was colloquially distinct from "The Perthshire".
I've now taken to calling it "The 'Borders' Hill Rally" (or 'The "Borders" Hill Rally')
In days of Yore, there were two Hill Rallies in Wales, one in Lincoln, and the "Scottish".... and there was a Hill Rally Championship.