[QUOTE=supershorty628;7229176]
There weren’t always regionals? Sorry, showing my age there!!
OP, genuinely curious, why does the location of the final make a difference? Not being snarky, I’m really just wondering.[/QUOTE]
The first year they changed the “all-included” approach was 1982, when the Maclay finals were at Madison Square Garden. Everybody came to the neighborhood, but there was a qualifying round on Friday at Overpeck Farm in New Jersey, a few miles outside of the city. The top 100 (I think?) got to show at the Garden on Sunday. Peter Wylde won that year.
Needless to say, all the people who traipsed across the country to only show on Friday in New Jersey and then go home were not too happy. So the next year, they started doing Regionals.
The location at the Garden was unique in that the time and space constraints in the middle of the city were pretty severe. Ask anyone who had horses show there, and everyone will agree that the logistics were a nightmare, but it was special and totally worth the trouble. 
They also had the Grand Prix on Sunday afternoon for at least some of those years, so that was another reason the Maclay class could not take up the whole day’s schedule.
I was there the time Michael Matz was one of the judges for the Maclay finals, and also won the Grand Prix. That was one of the years the show was held at the Meadowlands. He judged the morning session, changed into his riding clothes, won the GP, and changed back to judge the second round of the Maclay. I think the courses were a little similar, so that year, any equitation kid who said, “I’d like to see that judge ride this course!” could get their wish. Except the jumps were two feet higher. :lol: