> free on Sunday 18th
the 18th is a Saturday.
> over 6 hours each way by train
Trains in Germany. Funny idea. ?
Ask a colleague to join you that day, then you'll have a lift. Tell him, you pay for the fuel, the ticket for the fair and a lunch. That doesn't cost a fortune. Otherwise rent a car. That doesn't even cost 1/3rd of a snorkel. ?
If you feel generous, rent an X5 4x4 Diesel, to have some appetizer for the B57, and the four hours will be fun to drive (may be I should take a new job as a travel agent).
By car it's maybe four hours (one way). So get up Saturday 7 AM, have a breakfast, and at 12 AM you'll sit in the Grenadier. Take your time to walk around the fair, and drive home at 3 pm to have a dinner at 8 pm.
A great day.
Or spend a boring Saturday in the hotel ... ?
(I know, what I am talking about...)