The annual Southampton Boat Show is held in September each year, with over 600 exhibitors present. It runs for just over a week at Mayflower Park on the city's waterfront, where it has been held since 1968. The Boat Show itself is the climax of <answer>Sea City</answer>, which runs from April to September each year to celebrate Southampton's links with the sea.
What Southampton festival culminates in the Boat Show?
Sea City