Fri-Sun: Toy Boats at National Maritime Museum
More than 100 boats representing the liners, battleships and submarines that have defended the UK through its history are on display in Greenwich. 10am-5pm (until Oct 31)
Sat-Sun: Penguin at Southbank Centre
An eloquent penguin, a dreamy boy and a tale of twists and turns for ages 3-7, adapted from Polly Dunbar’s bestseller as part of the Udderbelly Festival. 2.30pm (ends May 23)
Sun: Primrose Hill May Fete
It’s a traditional village fete in a trendy postcode at this day of craft stalls, rides, fashion and a pop-up restaurant in a double decker bus. Tel: 07768 722226, 11am-6pm, Regent’s Park Rd NW1.