If you "submit" your signup but the website says your chosen date/time is no longer available, please check your email for a confirmation before choosing another date/time. Usually, the website message is wrong; your submission has successfully been logged by the website, payment has been applied, and a confirmation email sent to the email you provided. If you don't receive this confirmation email within a minute of submitting the form, please go ahead and select a different date/time. We apologize for any confusion and inconvenience, and are working to correct this glitch.