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Each summer Audi sponsors a series of classic music concerts, with the classical music open air being the arguable highlight. For a weekend in July, a stage is built onto the large lawn in the Klenzepark. The Georgian Chamber Orchestra and the Audi Wind Orchestra each play one evening. Bring a picnic set, sit down and listening to the music sounding around the old classical fortress walls. There is also a fireworks show.
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South of the inner city, on the right side of the river Danube, lies the Reduit Tilly, the core building of the classical Brückenkopf (Bridge Head) fortress. You can visit the World War I exhibition of the Bavarian Army Museum inside or take a walk around the surrounding park area (Klenzepark).
City Theater
Visit an ice hockey game of the ERC Ingolstadt, Ingolstadt's Premier League Ice Hockey Club and the German champion of 2013/14. During the season there is normally at least one home game per week.
An art museum.
Christkindlmarkt
At Christmas, the historic inner city transforms into a seasonal event. The heart is traditional Christkindlmarkt (Christmas Market), with wooden stalls selling food, Christmas gimmicks, Glühwein (lit. "glowing wine", warm seasoned wine) and other things, a merry-go-round and a story-teller. Another highlight is the outdoor ice skating rink in front at Paradeplatz.
Bayrisches Armeemuseum
The museum is separated into two locations. The Neues Schloss, a former duke's residence and part of the city wall, hosts a collection of military artefacts from different eras as well as a bunch of replicas. The Reduit Tilly, a part of the former state fortress in Klenzepark hosts a World War I exhibition. The latter is a very interesting and well structured museum, with exhibits and documents from the era and some short films which summarise the history. The Army Museum is being renovated in 2019, so some parts may be closed. Many of the captions are in German and they have something of a pro-Bavarian and politically conservative slant but the original exhibits are interesting even if you don't subscribe to their view of history.