45th season of the open-air concert series in the Zeltarena Oberes Schloss — 17 free concerts on Sundays from May to September
Sonntagnachmittag um 4 is a concert series that sets standards in the German festival landscape: Since 1982, the city of Siegen has programmed free open-air concerts on Sunday afternoons every summer — an institution that kicks off a new season with its 45th year in 2026. The venue is the Zeltarena Oberes Schloss, a covered open-air stage in the historic castle park in Siegen.
From May 10 to September 6, 2026, there will be 17 concerts, every Sunday from 4:00–5:00 PM (exception the last date, Sept 6: 2:00–5:00 PM). The program showcases the musical diversity of the Siegerland region — from Vlurfunk Big Band sound to accordion orchestras, choirs, jazz, and brass music, as well as pop and salon music. A new sound every week, a new audience from Siegen and the surrounding area every week.
The organizer is Kultur Siegen, the cultural department of the city of Siegen. The concept is deliberately accessible: every concert is free, no registration is needed, and it's held outdoors. This has created an intergenerational meeting point — seniors with glasses of sparkling wine, families with picnic blankets, students from the University of Siegen, tourists from the Siegerland and Sauerland regions. The format is part of the larger Kultursommer Siegen, which programs dozens of outdoor events annually.
Siegen is a university city in southern Westphalia with about 102,000 inhabitants — home to the University of Siegen, shaped by the steel and rolling mill industry, nestled in the hilly landscape of the Siegerland. The Obere Schloss on the Siegberg is the city's landmark — a former Nassau-Orange castle, now a museum and event venue. The Zeltarena at the Oberes Schloss is one of Westphalia's most pleasant open-air locations.
The 45th season continues a tradition unique in the German festival landscape: free, Sunday concerts throughout almost the entire summer season. 17 concerts covering the musical spectrum of the Siegerland region — choirs, orchestras, bands, big bands.
Updates at kultursiegen.de.
Free admission. No registration required. Catering available at the Zeltarena or separately in Siegen's Oberstadt.
Zeltarena Oberes Schloss, Schlossplatz, 57072 Siegen. By public transport: Siegen train station, then bus or a 15-minute walk to the Oberstadt. By car: A45 exit Siegen, then follow signs for Oberes Schloss.
17 concerts from May 10 to September 6, 2026, every Sunday from 4–5 PM. Exception for the last concert on Sept 6: 2–5 PM (Siegener Blasorchester 100th anniversary).
Free. No registration required.
Bring a picnic blanket and a folding chair. The event will take place even in case of rain, thanks to the roof. Catering is available at the Zeltarena or in Siegen's Oberstadt.
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Zeltarena Oberes Schloss
Oberes Schloss, Schlossplatz, 57072 Siegen