Accommodation is not centrally planned. All participants should make their own bookings (hotel or Airbnb-type) individually, either directly through hotel websites, or through accommodation booking websites.
The Economics Department where the ASSET 2022 Conference will take place is located just outside Rethymno city center in Gallos. The University is served by regular bus service from the city center. Rethymno is located mid-way between Herakleion and Chania and staying in either place is also an option. This would involve, however, travelling around 70km each way.
While quite a few hotels will still be operating at the end of October in Rethymno, the dates of the conference coincide with the end of the summer season thus availability may be limited and you should plan in advance. A list of hotels offering special rates to conference participants can be found here.
Note that October 28 is a national holiday in Greece.