Why do ticketing websites crash when tickets go on sale?

Because demand arrives all at once. An event that sells 5,000 tickets over three weeks may take half of them in the first ten minutes. Infrastructure sized for average traffic falls over at that peak, which is the exact moment the platform needs to work.

What happens to my sales if checkout fails during the announcement?

Most buyers do not come back. Attention at announcement is a one-time event driven by the post, the group and the moment. A buyer who hits a broken checkout usually does not retry later, so those sales are lost rather than delayed.

How do I know if a ticketing platform can handle my on-sale?

Ask what peak concurrency they have handled, whether the queue is fair or first-come chaos, whether scanning at the gate runs independently of the sales system, and what happens to a payment that is confirmed by M-Pesa but not recorded by the platform.

Does gate scanning fail for the same reason?

It can, if scanning depends on the same systems as ticket sales. Entry load is its own spike — thousands of scans in the thirty minutes before doors — and needs to hold even when the queue is longest.

Why Ticketing Sites Crash on Sale Day

Your announcement goes out at noon. The post lands, the groups light up, everyone moves at once — and the checkout drops.

By the time it recovers, the moment is gone. Not the demand exactly, but the moment: the burst of collective attention that makes a hundred people decide to buy simultaneously because everyone else is buying.

Downtime is not an inconvenience on sale day. Downtime is your sale.

Why the peak is so brutal

Event ticketing has one of the least forgiving traffic shapes of any online business.

An e-commerce store selling 5,000 items a month sees a fairly smooth curve. An event selling 5,000 tickets might take 2,000 of them in the first ten minutes after the announcement, then trickle for three weeks, then take another 800 in the final 48 hours.

The ratio between peak and average can be several hundred to one. Infrastructure sized for the average — which is the cheap way to build it — meets the peak and falls over.

Worse, every part of the system peaks together. Page loads, seat holds, payment initiations, M-Pesa callbacks, confirmation emails and SMS all spike in the same minute. A bottleneck anywhere becomes a failure everywhere.

The failure modes, and what each costs

The page will not load. Most visible, least damaging — buyers usually retry a page that is simply slow.

Checkout starts and dies mid-payment. The expensive one. The buyer has committed, entered their number, maybe approved the M-Pesa prompt, and then nothing. They do not know whether they have been charged. Now you have a support problem on top of a lost sale.

Payment succeeds, ticket never issues. The worst. The buyer has genuinely paid, M-Pesa has confirmed, and the platform never recorded it. You are reconciling by hand, refunding manually, and dealing with someone who is — correctly — angry.

Overselling. Under load, two buyers get the last ticket. Now you are refunding someone who did nothing wrong, or honouring a ticket you cannot seat.

The gate stalls. Different peak, same class of problem. Two thousand people arrive in the thirty minutes before doors. If scanning depends on the same systems as sales, the queue stops moving — and unlike a website failure, this one happens in public, in front of your attendees.

What it actually costs

A dropped checkout is not a delayed sale. Announcement traffic is driven by a moment: a post, a group, a friend saying have you seen this. That moment does not repeat. Buyers who bounce off a broken checkout mostly do not come back.

Then there is the part that does not show up in the numbers. Organizers who have been burned once start hedging — announcing quietly, staggering the on-sale, avoiding the big coordinated push — because they do not trust the platform to survive their own marketing.

That is the real damage. Your ticketing platform should not be the reason you market your event less aggressively than you could.

Questions to ask before you list

What peak concurrency have you actually handled? Not capacity in theory. What is the largest simultaneous load the platform has taken in production, and when?

Is there a queue, and is it fair? A proper queue holds buyers in order and admits them at a rate the system can serve. The alternative is everyone hammering the same endpoint and the fastest connection winning.

Does gate scanning depend on the sales system? It should not. Entry has its own peak and needs to hold independently.

What happens to a payment confirmed by the provider but not recorded by you? The honest answer describes a reconciliation process. Anyone who says it cannot happen has not run enough events.

Can inventory oversell under concurrency? Ask how ticket holds work when two people hit the last ticket in the same instant.

What is the rollback plan mid-sale? If a bad deploy lands during your on-sale, how fast does it get reversed?

You will learn a lot from which of these get a specific answer and which get a reassurance.

What we rebuilt

For V2 we put real investment into the stack underneath, sized for peak load rather than average load. The two commitments that matter:

The sale goes through. No dropped checkout at the exact minute your announcement lands.

The gate does not stall. Scanning holds when the queue is longest and the crowd is loudest.

And because infrastructure is only half of gate-day reality, we also put trained gate teams on standby — scanners who already know the system, so you are not recruiting and training staff the week of your event.

Announce like you mean it

The point of all this is not the uptime number. It is that you should be able to push your announcement as hard as you can and trust that the platform will take whatever your marketing sends at it.

If attribution tells you where to spend and prefinancing gives you something to spend, this is the part that makes sure the spend converts.

Our fee is 5% per ticket sold — no monthly subscription, no listing fee.

Plan your on-sale with us →