That's been discussed, talked about, and then discussed some more. Europe has been mentioned as a location. Both the east and west coasts of the US have been nominated. It was even suggested that Europe and the US alternate years. Most everyone seemed open to the idea it's just putting something together for real is the challange. Alembic doesn't have the staff or time to organize anything on this scale. Individual club members are also pretty much tied up with personal lives and business. It seems that since the Alembic Club is not really a club with any kind of structure the logistics get kind of muddy. With no dues there's no treasury funds to hire an organizer or guarantee a block of hotel rooms.
Sorry to be so wordy but all that to say, yeah it's been thought of but no, it hasn't been tried.
To quote an old movie If you build it, they'll come
Sam