Hey, Chris -
Let me tell you a couple of stories.
I towed my MG to Speedweek in 2014, only to run into the rain-out you encountered. Through the kind gestures and help of fellow racers, Wayne Yeats, Gus Ryan, Don Strong, Bud McManus, and James Stewart, I was able leave my car and tow car in Utah, I was sold an extra entry for World of Speed in September, given two airline passes home to Wisconsin, and was dropped off at the airport by my Aussie brother-of-a-different-mother in SLC.
A month later, the salt was dry, and we took a record that had stood for 22 years.
If not for the help of these folks, it might not have happened.
The Project '64 Mini Cooper Team out of New Zealand shipped the car over in 2015 for Speedweek. The event didn't happen, but they made arrangements with California based BMC enthusiasts to store the car stateside, pulled it out of dry dock in 2016, oiled it up, and walked away with records.
There is a network of very incredible people over here who will gladly step up to help, or at least point you in the direction of help.
If your bikes are ready to go and you're willing to store them for up to a year, and Speedweek 2017 doesn't happen, I doubt you'd have trouble finding help putting them up until 2018, or maybe as early as the Bike event later in August, or the USFRA event in September.
Yes, it would require flexibility, but getting people back and forth across the pond is a lot easier than bringing all of your kit back and forth.
So Mick Jones' vocals are asking a question that need not be asked. You should go, and if you have to, make arrangement for the bikes to stay until you go again.
One other thing - the other events provide much cheaper hotel accommodations than the big gig, because they don't draw as many people. Hotel discounts during Speedweek? "There's no point in asking, you'll get no reply".
But during the other events, the hotels are "Pretty Vacant". (always been more of a Sex Pistols fan . . .)