The agency has been charged with helping to increase visitors and to target audiences outside East Lothian, where the event is based.
Three Harbours Seafood Festival is one of only two seafood festivals in the country.
Launched last year in partnership with the arts festival, the seafood festival champions locally sourced seafood and East Lothian's coastal heritage.
The festival will be held at the Greenbelt, Prestonpans, with stalls hosted by local fishmongers, restaurants, wine merchants and organic food suppliers.
The Seafood Festival runs from 28-30 May.
Visitor numbers exceeded expectations in its first year and Hot Tin Roof's campaign aims to increase numbers from 3,000 to 6,500.