You're a star - thanks for the extra info. Yes, I thought perhaps we might want to think about staying over but haven't been able to get hold the one hostel that I found a link to. I was a bit worried about needing a youth hostel membership card in order to stay at the hostels. Clearly I don't have one. Are they terribly strict about that? I'll pursue it further as it certainly does seem like a lot to do in just one day.
Hope you managed to find someone to go to the German beerfest with you. I looked at that too, but it coincides with my partner's departure from the other end of the country