The Mannheimer Stadtfest is a free festival that takes place every year in the heart of the city. It features live music, delicious food, and a variety of fun activities for all ages. The festival is a celebration of the city's culture and history, and is a great way to experience the local community. The festival takes place over a weekend in the summer, and is a must-visit for anyone looking for a fun and budget-friendly event in Mannheim.