None that I know of. We have coverage uptill the start flag and starts back up once the race is over. Couple years ago there was a company that did cover Factory Series boats during the race, but they are no longer in business. Too many F2s got totaled while racing.
We use Blackadar Marine Insurance
blackadarmarine.com
Look them up and ask for Bill. He can explain and quote their coverage options for you.
Good Luck!