... The convention itself is to make it "official"...
It's a bit more than that, TIS.
While the conventions to 'officially' nominate the candidates, and we see get to see the big speeches in prime time, there's alot more going on behind the scenes. Party officials from all over the country gather & decide on 'platform' issues, and lots more shoulder rubbing etc. that would probably bore us ordinary citizens to tears.
Thats' the case with both parties, and including the Green/Libertarian/Reform and all the rest who put their candidates on the ballot every four years right along with the Dems and Repubs.
The Convention is a major undertaking and Gustav or no Gustav, I don't see how they can possibly postpone it. They could try to make it a bit more low key if things are going very badly with the storm and there will probalby be some key people who will have to cancel their appearances.
Apple