New year for boat calendar starts on September and from september to February you can find a boat show almost in every week somewhere in Europe or US.
Genoa boat show which is held on mid October is one of the most important and active shows in Europe. The show has a quiet big covered area andalso there are as many boats onthe harbor
EUROFLORA.... actually you can't arrive in genoa and go to Euroflora..... Euroflora is open only for 10 days every 5 years.... (it's quite an huge work to set it up!). last one was from april 21 to may 1, 2001. If you're planning to come to italy in those days consider visiting euroflora.
I can promise nothing of course.... the 5 last edition were amazing... hope next one will be better!