Participants are supposed to book their accomodation by themselves.
KEK Dormitory can be booked by following the procedure listed here
A limited number of rooms have been blocked for the nights of october 5th and 6th for those who are just coming to Tsukuba to attend the JENNIFER meeting (mainly T2K members). To book them please send an email to firstname.lastname@example.org
A list of hotels in Tsukuba can be found here