I stumbled across this site here, and It be a very useful one fer maritime events, i'll start listing some of the larger ones in the even section later!
Seabritain2005.com
Portsmouth have their "international festival of the sea" from the 30th june - 3rd july, part of it be an event fer the 200th aniversary of trafalgar square in portsmouth.
Festival of the sea
Arrrrr acursed Navy!
Also Bristol harbour be having their festival too
Bristol habour city festival
I be planning to bring me an' me crew to at least one o' these!
Anyone else care to join a pirate raid!?