Cologne was packed with people when I was over there...great atmosphere in the city altogether. As regards the Fan Fests, there are two of them that I could see. Don't bother going into the one beside the cathedral as it's small and has no big screen and is fairly dull in all aspects. Instead follow the crowds down to the main bar/restaurant area and you'll see the bigger Fan Fest. I didn't manage to get into this one cause I couldn't be bothered queuing but it did look decent from the outside.
There'll be a good few touts (usually scousers or cockneys) hanging around the cathedral area generally (or train stations at host cities). The going rate for the first round games was around 100-150 euro from what I could see. For the second round I'd say it'll be far more pricey though. There's no name checks on tickets at all so if you do manage to get some reasonably priced tickets I wouldn't worry about it.
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