Odds are equal for bad weather or 4/1 for good weather or 4/1 for very bad weather in Frankfurt
Why this city ? (serious question here)
it will be difficult to find a place that everyone loves/agrees with. the special part will be the event itself, the city is not that important except for central air/road/train hub.
-central airport, cheap worldwide direct connections, no hassle with changing planes
-equidistant to americas and asia
-easy/fast to reach city from airport
-lot´s of banking highrises (the idea was to make it a rooftop party in banking highrise)
-ecb headquarter
-germany first country to legally acknowledge btc, german government btc-friendly (e.g.no capital gains tax)
-sufficent infrastructure for events (catering, security, hotels, etc)
-since it is an one-night indoor event, the choice of city is important but not that important. frankfurt is topranking in all kinds of city-rankings anyway.
-promoters/organizers of party live in frankfurt, easy to organize, no fuck-up to expect
All the arguments could be made for Berlin as well. Well, all of them except ECB and the last one. Plus Berlin is probably more interesting for Bitcoiners in general. Thinking about it, there's been some pretty wild Bitcoin parties already. Not sure if they can be topped just because you throw in more money.
I'm in, anyways.
for example, try to find affordable direct flights from usa to berlin
from your viewpoint i agree, berlin is more attractive for such an event. from a promoters viewpoint it is much easier and safer to organize an event when one is familiar with local occurences.