If the event you've bought tickets to is using a waiting list, you'll have to wait for the event organizer's approval. We don't know how long will it take, but we'll make sure to keep you updated via email/SMS/Push notification.
In case you have further questions, you can always reach out to the event organizer.
You can get the event organizer's contact information by following these steps:
Go into the event page which you've bought tickets from.
Scroll down and hit the 'Contact the organizer' button.