La Mercè festival in 2026 will take place from September 23rd to 27th, although the official website states two different dates

The title tag, which is invisible but read by search engines, says September 24th to 28th. The description that Google uses for its search result says from the 23rd to the 28th. And the regular text, a few centimeters below, in a font that a person can actually read, says from September 23rd to 27th, 2026.

The correct information is the third one. The city council itself confirms this in its news section, and the press that covered the event also confirms it. However, the two incorrect pieces of information are precisely where they appear in search aggregators, AI assistants, and the snippet that Google displays before anyone visits the page. This is where much of the misinformation about this event originates.

It's worth examining this visually, as it reveals something about how institutional websites age. What a writer creates manually gets updated. What exists in the metadata, however, does not.

There's a second layer to the same problem. The address barcelona.cat/lamerce/es/el-pregon, which is what you would type to search for this year's proclamation, returns the information page for the proclaimer of 2024, with its date of 2024, under a title that says "La Mercè 2026." The menu on the homepage does lead to the correct site. The shortcut that seems obvious, however, does not.

The detailed program for La Mercè festival is always released at the last minute, and this year was no different. Therefore, this table includes only what has been confirmed by the City Council or by the media that covered the presentation, and excludes anything that doesn't yet have a published time.

Two items on that list are new this year. The parc de les Glòries is included for the first time, and with it, the squares of Sarrià and Comas. And the guest city is Shanghai, the first Asian city, chosen, according to Catalan News, to celebrate the twenty-fifth anniversary of its twinning with Barcelona; among others, the Shanghai Dance School and the Shanghai Acrobatic Troupe will be present.

This is the most practical piece of information in the entire program, and the one that most people will be looking for at the last minute. This year, the "Piromusical" (fireworks and music show) of La Mercè will not be launched from Avenida Reina Maria Cristina, in front of the Magic Fountain, where it has traditionally been held. The ongoing renovations at the Montjuïc Fairgrounds are preventing this, so the launch site has been moved to the sea.

Which beach? This happens again. The official news from July 22nd says playa del Bogatell. The official news from August 31st, on the same website, says playa de Nova Icària. They are two adjacent beaches on the same coastline, separated by a few hundred meters, but they are not the same.

The media that covered the presentation, including the English-language agency of the Catalan government, focused on the Bogatell area, and this is also what the more detailed version states, explaining that the fireworks are launched from the pier while the public is spread out along the promenade. This article focuses on the Bogatell area for that reason, and it does so without pretending that the matter is settled. Those who plan to attend on Sunday, October 27th, should check the official website on that day.

The rest of the show is quite clear. The musical selection is by Josep Montero, the vocalist of Oques Grasses; the mixing is by Marçal Cruz, from the Oido studio; and the fireworks are by Pirotecnia Igual, synchronized with the music. The practice of commissioning the soundtrack to someone from outside the organization is quite recent.

On Thursday, September 24th, the day of La Mercè, there is a local holiday in Barcelona. It is on the official calendar of holidays for the City Council: it is one of the two days that the city adds to the working calendar, along with May 25th of this year. It is a paid holiday that cannot be recovered, in technical terms.

For those visiting the city, this translates into three specific things, none of which are mentioned in the festival guides:

• The monuments are not closed: the Sagrada Família, Park Güell, Casa Batlló, and La Pedrera are open with their normal hours. It is not a holiday that causes closures.
• The time slots are filling up faster because, in addition to our regular customers, half the city is also trying to book, as they don't work that day.
• The public transportation will be operating on a holiday schedule, and there will be street closures in the city center for almost the entire week, not just on the 24th.

If your visit to a Gaudí work falls on those days, it is advisable to purchase tickets in advance and choose the first hour of the morning. The access rules for each monument, which vary quite a bit from one to another, are compiled on the page with tips, rules, and mistakes to avoid.

This is the part that really matters if you are in Barcelona during those days, and it's also where people get most confused. For La Mercè, around fifty museums and monuments in the city open their doors for free. The list includes the MNAC, the MACBA, the CCCB, the Museu Picasso, the Fundació Miró, the Museu Marítim, the Monestir de Pedralbes, the Castell de Montjuïc, the Pavelló Mies van der Rohe, and the six sites of the MUHBA.

And there are also two buildings that are of great interest to those who appreciate early 20th-century architecture. One of them is by Gaudí.

The conclusion of the table is the one that no one writes: None of Gaudí's major works have open doors on La Mercè day. The Sagrada Família, Park Güell, Casa Batlló, and La Pedrera are managed by foundations and private concessions, and on that day, they charge the same price as any Tuesday in February. Anyone who arrives on the 24th expecting to find them open for free will be in for a costly disappointment.

That price of €15 has a particular feature that is worth knowing: it is exactly what it costs at the box office, and it is also what is paid for the only ticket for the palace that is listed in the catalog. There is no resale markup to avoid here. The aggregators that are still publishing €12 are presenting today's reduced rate as if it were the general price.

And if the plan is to see Gaudí's work without paying an entrance fee, La Mercè is not the occasion: there are about half a dozen of his works that can be seen for free all year round, from the pavilions of the Finca Güell to the lampposts of Plaça Reial, and they are listed on the page about hidden Gaudí.

The Modernist Complex of Sant Pau, which is by Lluís Domènech i Montaner and not Gaudí, despite appearing on lists of "Gaudí's houses," has three days of free admission per year: April 23rd, the Night of Museums, and September 24th. This is stated exactly, with those three dates, on its own pricing page.

Just below, there's a line that almost no one reproduces, and it changes the morning plan: on days with free admission, there are no guided tours. You enter, you explore on your own, and that's it. The guided tour costs €21.00 for the rest of the year, and it's the only way to go down to the underground galleries that connect the pavilions, which are the best part of the site.

In other words: if you just want to see Sant Pau, the 24th is free. If you want to understand Sant Pau, any other day is better, and in the afternoon, as the price drops from €18.00 to €17.00 after 2:00 PM. It's the only modernist monument in the city that reduces the entrance fee according to the time of day.

In July, the City Council announced a show, produced in collaboration with the regional government, that commemorates the "Gaudí Year" and the centenary of Park Güell as a public park, featuring music and dances from local folk groups. This information is official and has been confirmed.

What doesn't appear on any official page that could be accessed today is when and where. Dates are circulating, but since they are not based on a verifiable source, they are not published here. Anyone interested will have to check the popular culture program when the details are released, which, in this festival, is usually the same week.

One last thing, in case your trip includes the basilica: the four types of tickets sold by the Sagrada Familia and the differences between them are compared, with the official price listed first, in the article about which one to buy. That price doesn't change for La Mercè.