We aren't the event organisers, simply their ticketing agent so we won't necessarily know.
Unless a the promoter has specifically stated that there will be door sales, there is no guarantee you will be able to purchase a ticket at the event.
It is always best to purchase your tickets ahead of time to avoid queues, avoid a more expensive door price and to ensure you don’t miss out on a fun time at the event.
Most event promoters will list a door price if it's likely to be available. If there isn't one listed, then it's likely door sales won't be available.
For events that are being ticketed by Eventfinda, a "Sold Out" notification will be posted if all the online tickets are gone.