Cultural events/'must sees' this wkend in Berlin?

Hello all,

I'm in Berlin this weekend, and keen to do a cultural event or two - any top recommendations or 'unmissables'? I'm into contemporary & classical art, museums, live music & classical music, photography... and will also see the xmas markets of course! If anyone else is planning something, I'd be happy to join since am visiting a friend with kids and won't be with her all weekend.

Danke!

Phoebe