As the event date approaches, the venue may release tickets that were previously held for the artist or team. Why are tickets released?
The artist or team may no longer need the tickets that were held when the event originally went on sale.
Once the stage or event area is set up, the venue has a better idea about which seats are obstructed. Sometimes events are so popular that even seats with obstructed views are released for sale!
TIP: Check back often!