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Two events coming up for you to consider:
Vigil in Trafalgar Square at 6pm on Thursday, 15 July
London United Festival (was going to be the 'Rise' festival) in Burgess Park, Camberwell on Saturday Afternoon (16 July)
If you want to do a separate event - you could just arrange a time and place 'flash mob'-style; Possibly in one of london's famous cememtaries or along South BankBabs, 13 years ago.