Sorry I can’t find any more details but it seems that Anthony Kiedis and Flea attended The Hoping Variety Show last night (Monday 21st Novemeber, 2011) in London, England. The event was a benefit evening for Palestinian refugee children and was held at the Cafe de Paris in London.
Edit: It seems that it wasn’t just Anthony Kiedis and Flea who were there as we first thought from the photos that came out showing just the two of them; RHCP were there and performed.
Thanks to Laura for the heads up on this
EDIT: More images are out and they show Flea and Anthony Kiedis on the stage.