Make changes to existing reservations online with the login credentials listed on your confirmation; by e-mail to nassannualmeeting@onpeak.com or by calling 800-545-1773 Monday through Friday, 9:00 a.m.–6:00 p.m. (ET). You must have the onPeak ID of the reservation you wish to change in order to make any modifications. Changes are based on availability and can be submitted to onPeak until mid October—please reference your confirmation email for more details. After the date(s) specified in your reservation confirmation, communicate further changes directly with the hotel. Cancellations to existing reservations must be made according to the individual hotel’s cancellation policy, which is also noted on your confirmation. Failure to cancel your reservation according to the hotel cancellation policy will result in a charge to your credit card.