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If you still see this message after clicking the link, then your browser settings are likely set to not allow cookies. Please try enabling cookies. You can find instructions at https://www.whatismybrowser.com/guides/how-to-enable-cookies/auto.
To defer your registration to the following year, navigate to Profile > Upcoming Events > Manage Registration > Defer Registration. The deferral deadline is 14 days prior to the event date and will be enforced.