Booking
One party's claim on one thing to attend. Carries attendance only: no price, no payment pointer, no refund columns. That is what lets the rows nobody paid for — a staff comp, an imported roster, a waitlist join — be a booking with no purchase rather than a fabricated $0 order.
Fields
The named attendee, or null for an anonymous party whose identity is the order's buyer — the case that lets someone buy four tickets without naming four people.
How many people this row admits. Session capacity is the sum of this across confirmed bookings, not a count of rows.