Nothing in mind for the next two days? Nothing? And the rain is killing you softly?
What about beer? Not one sip silently during a long trip with the U-/S-Bahn while waiting for the sun...but a beer festival with events and lots of beer and beer gardens?
5 August 12 o'clock it's the opening.
Are you in? It could be nicer than Oktoberfest, who knows?