There is always something exciting going on in Vienna. Are you in the mood for something old school? Or would you rather do something crazy and flamboyant? Do you seek family entertainment or nightlife fun? Whatever type of activity it is that you wish to pursue, chances are that something like that is going on in the city right there at that moment.
Here are a few websites that aggregate different events going on in the city. You can search for events by date, location or type of the event.
The official touristic website for Vienna has a section with a large database of current and future events
taking place in the city.