Christmas parties and New Years Eve celebrations at the Portsmouth Marriott. We promise you a festive season to remember! From fun filled shared Christmas parties, to welcoming in the New Year in style; we have events to suit every taste. Indulge in irresistible food using the finest seasonal flavours, all delivered with a warm, friendly and attentive service. The Mary Rose is the largest ballroom catering for up to 240 people and the Heritage Suite can cater for up to 120 people; both rooms have private bars.