Plus, the vendors we are talking about in many cases are outside the US (or Canada, as the case may be). So they are free to ignore whatever. Many will allow reservations to be moved, but they are under no obligation to do so. Frankly, I would doubt if many, if any, will allow cancellation and refund of money. The best chance one might have, I guess, is if you paid with a credit card and dispute the charge. No idea how that would turn out. Everyone is in an extremely difficult position.