Guide

Free event registration in Argentina: why no-shows are high and how to reduce them

By SOMOS DER · October 30, 2026 · 6 min read

At a free event, many registered people do not show up because signing up costs nothing and skipping costs nothing either. To reduce no-shows, remind each person that they are coming, make it easy to give the place back, overbook only with your own attendance rate and never beyond the venue capacity, and keep a waiting list for the places that free up. Then measure at the door how many really came, so the next edition is not a guess. This guide is for organizers based abroad running a free conference, open day or community event in Argentina.

Why so many people skip a free event

When someone pays for a ticket, not going costs them money. When they register for free, the registration is an intention, not a commitment: they signed up on a Tuesday night from a social media post, and on Saturday there is a birthday, it rains or they simply forgot.

The cost lands on you: catering ordered for 300 people that 180 eat, a large room half empty in front of the sponsor, and people who wanted to come but found registration closed because the places were taken by people who never arrived. When you organize from another country, you also have less local context to guess how your audience behaves.

We will not give you a market no-show percentage, because there is no open and reliable figure that fits every event. It depends on the audience, the day, the time, the weather and how long passes between registration and the event. The number that matters is yours, and below we explain how to get it.

Reminders: a week before and the day before

The strongest evidence on reminders comes from medical appointments, which have the same problem: someone commits to going, pays nothing at that moment and sometimes does not go. The Behavioural Insights Unit of the New South Wales government in Australia tested SMS reminders at two hospitals, sent seven days and 24 hours before the appointment, and missed appointments fell by 33.7% against the same period of the previous year. They note it was a before and after comparison, so other factors could have influenced the result.

For an event, that means one reminder a week before, while people can still rearrange their plans, and another close to the day with the practical details: address, opening time, which entrance to use and a request to bring the QR on their phone. PASE sends the QR and the badge in PDF by email at registration, and if the event has a start date set, it emails the QR again to everyone registered one to two days before the event. The reminder a week earlier, and any message asking people to confirm, you send yourself from your usual email tool to the list of registered people. Anyone who cannot find the QR email can use Recover your access on the registration page.

The registration page and the QR email are available in Spanish and English, and adding ?lang=en to the link forces English, which helps if part of your audience comes from abroad. Keep in mind that Argentina's personal data law, Law 25,326, says data cannot be used for purposes different from or incompatible with those for which it was collected. Reminding people about the event they signed up for is within that purpose; promoting something else is not, unless you informed them and they agreed at registration.

What to say in the reminder

In the United Kingdom, a trial published in PLOS ONE with 10,111 patients at a London NHS trust compared different reminder texts. The message that stated the specific cost of a missed appointment brought the no-show rate down to 8.4%, against 11.1% for the existing message. In a second trial, the specific message (8.2%) also did better than a message that described the cost in general terms (9.9%).

A free event has no money cost to show, but it does have a concrete consequence: other people are waiting for that place. A text you can start from:

• What and when: the event name, the day, the opening time and the address.
• The concrete consequence: "Registration is full and people are on the waiting list. If you cannot come, let us know and we will give your place to someone else."
• One single action: a button or link to say they are not coming. Nothing else.

Ask for confirmation and make it easy to give the place back

People who already know they will not come rarely say so, because saying so takes effort. Make it easy: in the reminder a week before, include a link to a short form ("Coming? Yes / I cannot make it") built with the tool you already use. Every "I cannot make it" is a place you can offer again with time to spare.

What you should not do is delete people who did not reply. Not answering is not the same as not coming, and if they turn up at the door with their QR, they need to be able to get in.

Overbooking with your own data, never beyond capacity

Overbooking means opening more places than the capacity, counting on part of the list not coming. Done by feel, it is the fastest way to have people stuck outside a full door. Done with a method, it is reasonable:

• Get your attendance rate: real entries divided by registrations, from the previous edition or a similar event with the same audience.
• Do the math: if your capacity is 300 and your historical rate is two thirds, 450 registrations would leave you close to full. That example only shows the calculation; use your own number.
• Stay a little below: the rate changes from year to year, and ten empty seats are better than twenty people on the sidewalk.
• The ceiling is the licensed capacity: how many people can be inside is set by the venue's permit, not by your calculation. Decide and write down what you will tell whoever arrives when it is full.

If you load the venue capacity in PASE, it sends an email alert at 80% and 100% of entries. If you have never measured, do not overbook the first edition. Use it to get the number.

A waiting list, by hand and in order

When places run out, do not just close: open a separate waiting list form and keep the order of arrival. Each time someone gives their place back, send the registration link to the next person. They register, receive their QR by email like everyone else and appear in the report like the rest.

If a place frees up at the last minute, on the day, manual registration at the door lets you add someone from the list without breaking the record.

Measure real attendance, or next year you guess again

Everything above depends on one number: how many of the people who registered actually came. In PASE each entry is recorded when the QR is scanned, and the post-event report shows real attendance, peak hours and entry times, split by attendee type. The report is in Spanish. If the event has guests, press and general public on separate links, you will see that each audience skips differently, and that changes the overbooking math for each one.

Keep that report with the date, the day of the week, the time and the weather. After two or three editions you have your own rate that you can trust.

No-shows are not guessed: they are measured at the door, reduced with reminders and offset with your own number.

Frequently asked questions