There is so much to see this weekend!!
Here are some of the exhibitions right now:
http://www.padlondon.net/ - for vintage design and art
http://www.hellshalfacre.co.uk/ - a Lazarides galleries exhibition in The Old Vic Tunnels
http://www.friezeartfair.com/ - Frieze, of course
http://www.monikerartfair.com/ - alternative Art fair in Shoreditch
I am sure there is more..