The local organizing committee does not arrange hotel accommodations.
You can find hotels near Tsukuba station and Kenkyu-Gakuen station (the next station from Tsukuba Station). Shuttle buses will operate between Tsukuba St. and Kenkyu-Gakuen St. and KEK in the morning and evening.
Recommended Hotels
Near KEK
Urban Hotel https://urbanhotel.co.jp/
Near Tsukuba Station
Hotel Nikko Tsukuba https://www.nikko-tsukuba.com/eng/
Hotel JAL City Tsukuba https://www.tsukuba.hoteljalcity.com/eng/
Daiwa Roynet Hotel Tsukuba https://www.daiwaroynet.jp/en/tsukuba/
Hotel Grand Shinonome (15min walk from station) https://www.hg-shinonome.co.jp/english/
Toyoko-inn Tsukuba (Sep.11 open) https://www.toyoko-inn.com/eng/search/detail/00376/?utm_source=google&utm_medium=mybusiness&utm_campaign=gt_web376
Near Kenkyu-Gakuen Station
Hotel Bestland https://go-hotel-bestland.reservation.jp/en
Toyoko Inn Kenkyu-gakuen Ekimae https://www.toyoko-inn.com/eng/search/detail/00228/