Southsea Castle is the ideal venue for an event in a fantastic historic setting by the sea. Castle Keep - offers direct access onto the castle ramparts with views across the Solent to the Isle of Wight and is ideal for smaller intimate events, maximum capacity of 60 persons. Castle Marquee - the on-site marquee has its own bar, maximum capacity of 200 persons, 120 seated. The Courtyard - the castle's on-site restaurant provides all catering options for food and drink across the site and also has indoor and outdoor seating including a roof top bar on the castle ramparts.