Support us Events Swim Serpentine Swim Serpentine is a one-day open water swimming festival staged in the heart of London on the 22nd September 2018. Organised by London Marathon Events, the festival is held in and around the beautiful Serpentine in Hyde Park, the venue for the open water swimming competition at the London 2012 Olympic Games. 5,000 swimmers will take part in this exciting new mass participation event. EdUKaid has places available over 2 miles - participants must be aged 16 or over. Get in touch if you are interested - registration closes on 24th August!!!