The way I see it is, there is only about 3 post from racers that have every done the standard Internats format. The Internats did not get be a long event until it was change in 1989/1990.
Way the standard format for US1 worked is;
Saturday open water
Sunday straight away trophy trials
Monday continuing straight away trophy trials and start of oval trophy trials
Tuesday continuing of oval trophy trials and open water at the end.
Wednesday heat racing for National champion begins. *(note)
Thursday continuing heat racing
Friday continuing heat racing
Saturday over run of heat racing if needed and any special classes.
Saturday evening Banquet and awards.
*(note)
Notice that I said National Champion heat racing begins
This type of even set up a dual event. For the one that would like to be US1 you would have to enter the trophy trials. This does not mean that you would have to run them. You would get a zero for those events. Has anyone won US1 this? Yes they have and can be done.
With this said if you want to come in the middle of the week for the National Champion there is nothing to stop you. And if you entered the trophy trials you may wind up being US1. But if you want to come for the whole event of the trophy trials and heat racing you can do that.
To be a US1 is special. They are not handed out easy, but these days they do not carry the same weight.
I have included a article that I wrote back around 2007 when the Internat crashed after the 2006 internats.
What is US.doc