Still some time but not so long to go. On the 11th of April starts the Canstatt Spring Festival (Cannstatter Frühlingsfest). You will find all the things you can find at the "Oktoberfest" in Munich which will be known to most people. There are large tents catering traditional German food and - of course beer - as well as non alcoholic drinks and a large variety of other stuff. They will offer folkloric German music as well as modern Rock or Techno - just choose the tent which you fancy the most. Before that - why not take a trip on the roller coaster and have some cotton candy or toasted almonds.