The hotel Agora Seehotel (www.agora-muenster.de, great location next to the lake, 20 min walk to the venue, bicycles available for rent 6 €/day) offers reduced rates for GI Zeitgeist participants during the conference:
Double room used by one person, Breakfast included 80 € per night
If you would like to share a room with a colleague:
Double room used by two persons, Breakfast included 100 € per night
For reservations please contact the hotel (email: firstname.lastname@example.org; phone: 0251/48426-888) and indicate that you are a participant of GI Zeitgeist.
More hotels in Münster can be found here: www.muenster.de/stadt/tourismus/en/hotels.html
A cheaper alternative, which is close to Agora Seehotel, is the hostel Jugendgästehaus Aasee Münster (www.djh-wl.de/jh/muenster/, 15 min walk to the venue). There are no special rates for GI Zeitgeist participants. There are one-to-four-bed rooms, starting at 26 € per night in a four-bed room.