The shows would get cancelled 100% sure of it. Wether or not the fans should get a refund is another story and I have my opinion on that matter. Tickets for shows are often bought months in advanced, and you're not really sure what's gonna happen between that time so the venues/promoters should make it easier for their costumers toget a refund (at least 85%) if something unforseen happens between that time and not have the fans basically try to re-sell the tickets for a cheaper price.

But that's just my opinion.....