If you are asked for your personal information to purchase a ticket, it is simply for security reasons:
Name - staff at the entrance to events reserve the right to check your identity.
Email address - your email address is used to send you important information, such as a confirmation email after you have made a purchase, or to give you access to a stream. Make sure you enter an email address that you have access to.
Date of birth - we ask for your date of birth because it is a legal requirement that allows us to protect the rights of people of all ages.