You will change there on your way to Rimini? I don't have a concrete recommendation, but here is a list of football bars und pubs in Düsseldorf and near cities:
https://www.fussballgucken.info/locations?finder_type=2&city=Düsseldorf&s=Suchen
You are welcome for a sightseeing trip and a few beers sunday night beside the tourist traps! I am a German TAM and live in Berlin. I will take the same flight (ryan air) on monday to Bratislava.