January, 12th to 14th, 2007, Oberwesel. Other information is online at http://www.larp-mittelpunkt.de/?mod=info.
Oberwesel is located about ~75 km west of Frankfurt, by the river Rhine. Flying to Frankfurt airport and then taking a train is one option.
If you stay and extra day and return on Monday, flying gets a lot cheaper. Blue1 has flights for a bit over 200 € currently, and you have to take a connecting flight from Stockholm, Copenhagen or somewhere else. Ryanair costs a bit over 50 €. The local airport is near Tampere, so add the cost and time to get there.