Yes, advance booking is required, and this luau usually sells out.
1 table currently fits up to 11 people, and parties will generally be seated with other parties.
If your group is larger than 11, you will be split into adjacent tables.
While submitting as one booking is recommended, if you do book separately, please make sure to answer the question at checkout about Associated Bookings so you are seated with or near each other.
After completing your booking here, you will get an email (usually instant) with all the confirmation details, and you can just check in under your name (no printed tickets or vouchers required). You will not receive specific seats listed in your confirmation email, but the staff will lead you to your assigned table upon check-in.