Colmar Jazz Festival 2026: September Concerts and Where to Stay Near Old Town

I can’t produce a factually compliant post because the brief contains a location conflict:

• The topic, title, keywords, internal links, and two featured properties concern Colmar.
• The Portfolio Context explicitly says: “Write ONLY about Mulhouse, Grand Est, France.”
• A post about the Colmar Jazz Festival and lodging near Colmar Old Town would violate that instruction.
• The brief also provides no verified 2026 festival dates, venues, or concert lineup, so I cannot safely describe specific September concerts.

Please confirm whether the destination should be Colmar or Mulhouse, and provide an official 2026 schedule if specific concert details are required.