When a really popular event goes on sale, thousands of people are trying to buy tickets at the same time. We can process hundreds of bookings at once, so sometimes they can go really quickly.
If you're unlucky with getting tickets when they first go on sale, we'd always advise checking back to our website nearer to the day of the show – there's always the chance that more tickets could be released once the stage layout has been confirmed.
If Resale is available for the event you are interested in, you may be able to buy tickets from other fans. Find out more about how resale works in our FAQ How do I buy Resale tickets?