Just off the plane from my holidays there where so many events daily.
One that I want to recommend quickly, is the Fair Fair in front of the MuseumsQuartier this weekend. The food area in the white tents is pretty great and the food awesome; for having a nice lunch there as well as to stock up for home.
Find more pics from my visit yesterday in my FB Austrian Foodies Album
or read my review from last year in german.