Considering that Japan has these events relatively often, and they are relatively localised, it is surprising that they have no alternative venue regulations, rather than actual plan, in place. I was happy Japan had the event,but I am sorry now and hope that it never goes there again.
It is not beyond the wit of humanity to write in a regulation saying that group matches may be moved to an alternative venue and played within two days of the scheduled event if a match is cancelled due to weather, and I cannot believe that a country famed for its ability to get back on its feet after natural disasters could not logistically do it.