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Round up your pals and head to a mass bubble blowing session on Serpentine Bridge. The flash mob will get as many people creating beautiful bubbles together as possible, before inviting members of the public to join in. You'll need to bring along your own bubble making contraptions and sea-themed, summery costumes are encouraged. Pack a picnic to enjoy at the after-party on the grass where you can hang out with other bubble loving Londoners.