Amazingly, there are still a few tickets available for Martha Argerich's next London appearance, in the intimate surroundings of Kings Place on 4 July.
Perhaps the programme (mostly tango) or the large number of other musicians involved won't be to everyone's taste, but I think it sounds like a fabulous evening.
Here she plays Chopin's Mazurka Op.24 No.2 at the 2009 Nobel Prize Concert:

