Hi sammohanty, I’ve been to Vienna a few times and there are lots of nice things to do there in the evening. It has a huge history of classical music as some of the greatest composers lived and worked there as I’m sure you know. There are always classical music concerts on, you can buy the tickets from websites or from guys selling them outside the Stephansdom. That is a really nice way to spend an evening in Vienna. Some of these concerts include ballet and opera too. http://www.wien.gv.a… is a good site to get information about what’s going on. Enjoy your trip.