What if I am under the age of 18?

All persons under the age of 18 are considered minors, and to participate in an event a minor is required to be signed in by a LEGAL GUARDIAN.

The legal guardian must also provide proof of legal guardianship, with any of the following:
Parents Medicare card listing the minor and the legal guardianA court order or letter of guardianship signed by a judge when they were appointed as guardian by a court

If you are an independent minor you will have to provide government documents confirming your independent status.