There is sometimes a small possibility that a production may have holds they don't require, and, if so, a small number of tickets could become available on the day or week of the show. If so, these would become available via the Ticketmaster event page. There are no guarantees of these releases and we can't provide any advance notice/hold any waitlists.
Separate to that, there is a chance that other ticket holders may list their tickets for fan-to-fan resale via Ticketmaster, if Resale is available on the event. Again, these tickets would become available on the main Ticketmaster event page.