When a customer's going through your booking flow, you can recommend ways to make their visit a bit more special - and they can act on the recommendation without leaving the booking flow
The first is an upgrade: swap the ticket they've selected for a different ticket type, usually at a higher price. So if they've picked a standard ticket, you might offer them a VIP option that includes a pre-show drink, or a meet-the-artist add-on
The second is an add-on event: rather than swapping their ticket, you're selling them an extra event alongside the one they're already booking - a workshop, a talk, a tour
The first iteration of Event Upsells will be for non-allocated venues.