Can I purchase under 18 tickets if they weren't purchased in the same transaction as an Adult ticket?

Ideally we ask that the under 18 tickets should also be purchased in the same transaction as the adult tickets (aged 21+) who will be attending. However it isn't an issue if you need to purchase the tickets separately. It would be best if you purchase the new under 18 tickets using the same email address you provided when purchasing your Adult tickets. You will all need to arrive together at the same time.