The label 'SOLD OUT' is only given on our website, when the promoter of the event requests us to do so.

For a lot of events, you'll see the label "Limited availability"

This means that there are only a few to no tickets left. If you get the notification "We couldn’t find the tickets you searched for" after selecting your tickets, this does mean there is no availability, even if the event isn't labeled as SOLD OUT. 

For a lot of events, you have the opportunity to resell your tickets on our platform. An event is therefore rarely truly sold out, since tickets can become available if someone chooses to list their tickets. 

Even if you see the label Limited Availability, it can still mean resale tickets are available.