That experience isn't uncommon. Too often, in a metropolis, they relied on a steady stream of new recruits. Retention (always the easier option!) wasn't a consideration.
I've seen this living in a large city (4.4 million people in the metro area) with many tango schools (just in that area, at least 8 dedicated ones, plus several kind-of, sort-of ones; in the satellite communities, many more). For sure some schools work on retention, but most seem to live on a steady stream of Tango I-III (and sometimes Tango IV-VII) students who never seem to graduate to attending milongas.
I'm not a fan of 'social media' for advertising events, but if that's where you can recruit...
Like it or hate it, it's how things work in 2026 – especially in metropolises.
The schools where I live are mostly not situated where anybody would walk past and see advertising. Two are in core areas but upstairs above businesses that occupy the street front, one is behind one storefront among many in an area nobody visits at night because the stores are closed, one is in a loft far from the core, one is in a basement far from the core, two are in an area most people avoid for safety reasons, and one is on a quiet side street in a residential area known for one-way streets and impossible parking. None are in secure, busy parts of the city core, at street level, with premises that look like dance studios, near parking. And of them all, one or generously two have signage.
So, how will they attract people to start tango out of the blue? Word of mouth is worthless in a big city. As I said, there's little to no hope for foot traffic. I guess there's other physical advertising . . . but where? The city tears down posters and shop owners here rarely give permission to poster their premises. Television ads cost a fortune. Radio is basically dead and newspapers are deader than dead.
That leaves the Internet. And really, that means social media. Sure, you can have a website and rely on SEO to get hits if somebody types in "tango," but that isn't as good as seeing friends and acquaintances on your extended social-media network sharing and "liking" stuff. Viral social-media advertising is by far the most powerful kind for those who cannot afford TV ads (and often, even for those who can).
Just a FB note for the weekday, and week in the month, for the milonga - and that from a few years ago. No response to messages.
That underlines why even social media can fail: You do actually have to have someone wearing the "social media manager" hat, going online a few times a day to update event pages, drum up interest by sharing those pages to various groups and sites, post occasional non-event content like discussion topics and photos, check messages, etc. Which is all doable using a phone while waiting for coffee, so I'm not sure why people are so bad at it.
But, back to the original point, many AT organisers only seem to be interested in 'preaching to the converted'.
Yes, and for them, weird locations, word of mouth, and infrequent social media updates are fine . . . they're relying on people who already know how to dance Argentine tango knowing that they exist, and knowing where to go at what times. The problem is, as you suggest, when organizers decide that's "good enough." It might be "good enough" this week, this month, and even this year, but it won't remain "good enough" forever.
I can't decide whether the cause is cliquish indifference to bringing in more people, laziness, technological incompetence, or the misguided belief that when the master is ready, students shall appear. It can't really be difficulty . . . when I ran an event, I created new ads with new (usually bad, but new) art and photos for each week, put those on event pages for the week, shared those event pages on my main page and all the local tango groups, and mass-invited all followers of the main page to every event. When attendees took photos, I shared those as well. I also had loyalty cards. And this was despite having a full-time job. It took me, oh, about an hour a week.
That was in 2016-2017. With the AI tools we have in 2026, it'd be much easier.