If the Six Days was to come to the North America again keep the following in mind. It takes a minimum of 500 riders for a promoter/country to put on an ISDE and not lose money. Normally the Europeans only send around 150 to 200 riders to a Six Says when it is outside of their continent so the rest of the riders would have to come form North and South America.
Back in 94 the US had 40 riders that qualified to run the Tulsa Six Days through the Qualifier series (there were 8 two-day qualifiers that year and your best 6 days contounted toward your qualifier score.) They also had a "buy in" that allowed 160 riders to just pay a $500 fee and compete in one of the US qualifiers to ride. The latter was the easiest but you didn't get a free Aria Skunk Stripe helmet for qualifying like the qualified riders got.
That year (in Tulsa) Team USA pit support was only available for the two trophy teams and a three rider "high power" club team, the rest of the riders had to arrainge their own pit support.
Each three rider club team had to work out the logistics of pitting for their three riders. District 36/37 ? (California?) pooled their resources and supported their riders (something like 40 riders I believe) at each pit.
At least thats how I remember it.
If you want to ride and aren't able to qualify I'm sure you could come up with an alternative way of riding the event at least its cheaper.