Event· Düsseldorf
Jahnstr. 47, DRK-Haus Friedrichstadt 26-1912
I don't have enough information to determine what specific event this refers to. The text appears to be a location reference — "Jahnstr. 47" is a street address, and "DRK-Haus Friedrichstadt" suggests a building associated with the German Red Cross (DRK) in Friedrichstadt, while "26-1912" might be a date range, room/section number