Please see the link for accommodation arrangements by Kinki Nippon Tourist Corp. as below.

The above rates are valid only during the period of ICCT Conference (Jul 30 - Aug 4, 2023 [JST = GMT+9]). Accommodation on dates other than the listed dates on the online reservation system can be requested but cannot be guaranteed at the same rate. If you would like to stay before/after the conference, please send inquiry email to the ICCT Registration Desk (icct2023_regist@or.knt.co.jp).

Senri Hankyu Hotel (https://www.hankyu-hotel.com/en/hotel/hh/senrihh)
Minamisenri Crystal (https://crystalhotel.jp/minamisenri/)
Hotel Claiton Esaka (https://www.claiton.co.jp/esaka/english/)
APA Hotel Shinosakaesaka-Ekimae (https://www.apahotel.com/en/hotel/kansai/osaka/shinosakaesaka-ekimae/)

You can book hotels in Osaka individually. However, the ICCT2023 organization will not be held responsible for any issues.

Here are some ways of booking hotels:
http://hotels.com
http://booking.com/hotels
http://travel.rakuten.com/
http://www.jalan.net/en/japan_hotels_ryokan/
https://travel.yahoo.co.jp/ (Japanese language only)

We recommend that you book your hotel early, to ensure that you get the rate and location that suits you best. Osaka is a major tourist destination, and hotels tend to book up quickly.