It will feature a Saturday outdoor market and barbecue, with a family day on Sunday.
Diners will be offered shellfish and champagne on Friday night, with other days devoted to mussels, oysters and curry.
Sea how the RNLI benefits
LIFEBOATS will be "squids in" when Loch Fyne restaurant in Newhaven holds a charity seafood festival from 7-13 June to raise funds for the RNLI.