As you know, the biggest beer festival in Germany is Oktoberfest. You may not know that the second largest beer festival is the Canstatter Wasen (aka Canstatt Volksfest) in Stuttgart, which begins on Sept. 25 and runs through Oct. 12. You definitely won't find the cheapest hotel rooms in Munich and Stuttgart during your visit! And by the way, the Mercedes Museum in Stuttgart is about 500 meters away from the Volksfest - so I would advise getting tickets online, otherwise you will wait in line. By the way, if you're interested, Mercedes' largest assembly plant is located in Sindelfingen, which is 20km SW of Stuttgart. They offer factory tours, but you definitely need to book in advance.