Barthelmarkt is a long-running folk festival held at Oberstimm near Ingolstadt, known for beer tents, horse trading traditions and a distinctly Bavarian fairground atmosphere. It is seasonal by definition, but when it is on, it is one of the area's liveliest cultural events.
Travelers should treat it as an event rather than a permanent sight: dates, crowds and transport planning matter. If your visit lines up with the festival, it can be a memorable local contrast to Ingolstadt's museums and fortifications.