Of course! You can do it online, subject to availability, by selecting "Modify the registration" on website: na.eventscloud.com/ereg/index.php?eventid=541529.
Please use your e-mail address and last name to log in to your account. Continue the registrations until the hotel booking page where you will be able to make changes. Once you complete the changes, please remember to proceed to the summary and payment page to settle the extra payments. Refunds will be settled after the event is finished.