These messages will show when the initial ticket allocation for a particular event has sold. This means that there are no tickets available for sale for the event date and time you are looking for.
While we cannot guarantee that more tickets will become available for any event, we recommend that you check back on our site regularly in case tickets do become available. It's also a good idea to sign up for a MyTicketmaster account and elect to "Get Ticket Alerts" for your event to stay updated with any new information or ticket releases.