Oi...don’t diss Kylie...Exactly.
But tbh it wouldn't even matter if Kylie was on at one & some other similar shite on at the other, provided those acts are popular.
But it needn't even be two music events, you could have Kylie at one & Monster Trucks or some shite at the other.
With the advent of Brexit, it would also be good for the low paid workers who set all this shit up, to have more than one venue available to make it easier for events to tour here.