A separate website for booking of accomodations (Grand Park Otaru and other hotels in Otaru) will be open soon. You will be able to access to it from this page.
In the conference venue, Grand Park Otaru, about 90 twin (and partly triple) rooms will be available. However, there are no single rooms in the hotel, so it will be expensive if one person stays in a twin room. Some other hotels in Otaru city will provide single rooms: they can also be booked on the booking website. We also recommend to share twin rooms of Grand Park Otaru by two persons.