At this point, you need to register on-site. Registration opens at 8AM, Monday Oct. 27. All cancellation requests or registrations being paid by check must be sent to Erin Dolan of ACM's "SIG Services Department": FAX: +1 212-302-5826 Email: dolan@hq.acm.org In order to process any refunds, please FAX the original registration form that includes the credit card information, or provide the credit card number in either a FAX or email. If you are sending the original reg. form, please write CANCEL on the top of the form.