I'd give at least an hour to get to the stadium from the city centre, and would advise you avoid the 'fan fest' altogether. There's a better atmosphere in bars in the centre of town.
Can recommend a good bar just beside the HauptBahnhof, called Hibernia. They serve Gruben Pils there and the stuff is like amber nectar. The big screen is quite good too.
We had three Gelsenkirchen games, and stayed in Cologne or Dusseldorf for each of them. Would recommend either place ahead of Gelsenkirchen. (Dusseldorf is a little closer to Gelsenkirchen, but isn't a host city.)
Hibernia Brauhaus: Bahnhofsvorplatz 2, Gelsenkircen;
tel: 02 09 20 8531;
www.brauhaus-hibernia.de
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