The geographic center of the United States is near Lebanon, KS.
Plenty of contiguous ground space if it doesn’t rain. I think there are two or three airports in Kansas, but not sure which one is closest or how far.
Native Angelenos have an expression “oh, you’re from back east”, which can be used to refer to anyone who was born east of San Bernardino.
So Vegas works because it’s back east. Anaheim does not. Both have indoor venues that would hold the entire metropolis of Lebanon, KS.