To obtain the necessary amount of meeting and exhibit space, COSM must commit to using a minimum number of guest rooms. If that commitment is not met, COSM will incur significant financial penalties and it will cause a major impact on the future programs that COSM is able to offer. By booking your room under the official COSM room block, you help COSM meet their hotel obligation. We thank you in advance for your assistance.


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Hyatt Regency Chicago
151 East Wacker Drive
Chicago, Illinois 60601 United States

Phone: 1-888-591-1234
Book directly through this link.

COSM Room Rate: $295.00 per night plus taxes 
Deadline: April 22nd or when reservations block is filled

Cancellation Policy: Guest must call by 3:00 PM CST; 24 hours prior to their scheduled arrival date to cancel the reservations to avoid being charged one (1) night room and tax. Any reservation that is not canceled and does not arrive will be charged one (1) night room and tax to the guaranteed method of payment on the reservation.

Need assistance with your hotel reservations? Contact

NOTE: It has come to our attention that companies, not affiliated with COSM or COSM Societies, are claiming to offer COSM registration and housing services. Registration and Housing should only be accessed through the COSM website and reserved through COSM’s official registration and housing providers.¬†