TMD at 17: A Data Story

In May I posted 17 Years of Tangomarathons.com — a few screenshots and a link to the full data story. That link went dark when the TMD site changed, so here is the story itself, rebuilt where it belongs: on this blog, animated, with 2026 tech instead of screenshots.

The original was a 1.5-hour exercise with the TMD data, VS Code and GitHub Copilot that kept growing. This version keeps every number true to that January report (data vintage Jan 19, 2026) — the charts are rendered at build time from the same database export, and they animate because a chart that grows in front of you tells the story better than a flat picture.

What Is a Tango Marathon, Anyway?

The modern tango marathon emerged in the early 2000s as an alternative to traditional festivals. While festivals focused on shows, workshops, and famous teachers, a growing segment of dancers wanted something different: pure social dancing, for hours on end, with a curated guest list ensuring quality partners.

Most marathons and encuentros do not use first-come-first-served registration. Organizers review applications and select participants based on dance experience, maintaining exact leader/follower balance, and building a community of compatible dancers. That curation is what distinguishes the format — and it is also why encounter data is so hard to collect: the scene runs on invitation, not on public event pages.

At a Glance: 17 Years of TMD

Includes 204 estimated phantom events — more on those below.

How the Data Works (and Where It Doesn’t)

Transparency before trend lines. This analysis uses 3,383 events in total: 3,179 real events recorded in the TMD database and 204 phantom events — estimated historical editions.

Many long-running events existed before TMD began comprehensive tracking in 2009. When we see “17th Prague Marathon” listed in 2023, we can reasonably infer editions 1–16 existed. Phantom events are our best estimates of those missing editions, and all analyses here include them unless noted. That gives a more accurate picture of the scene’s true size and history — and it is also why the numbers should be read as estimates, not gospel.

What we can measure well: marathons (TMD’s core focus since 2009 — high confidence). What we cannot: encuentros (significantly underrepresented — many never submitted), and anything organizers never put on a website. Still not done, not finished, not perfect.

Growth Over Time

The shape tells the story by itself: a handful of events in 2009, a real takeoff around 2012, a steady climb to 339 listed events in 2023 — and the dip in the middle that needs its own chart.

The Pandemic Story

Quarterly listings hold around 55–95 events until early 2020. Then the world closes: Q1 2021 lists 3 events — three, on an entire planet that usually dances dozens every weekend. The recovery follows through 2022, and 2023 (339 events) ends up exceeding pre-pandemic 2019 (265). Note that listings include events that later cancelled — the true low was even deeper; based on series patterns we estimate 18 editions were cancelled in 2020–2021.

Where Events Happen

761 unique cities worldwide after normalizing city names (Praha → Prague, Roma → Rome — the small work nobody sees). Europe dominates the scene, with Italy leading at 517 events over the whole period; Budapest, Istanbul, Berlin, Basel and Riga top the city list.

The Institutions

Some events simply refuse to die. Based on our analysis including phantom events, the hall of fame — events running 16+ editions:

A note on numbering: events like Maracuentro run multiple times per year, so “30th edition” can mean 30 seasons rather than 30 years.

What We Can Confidently Say

• 70% of marathons include food — a defining characteristic of the format
• Marathons grew dramatically: ~136 events/year (2012) → 334+/year (2023)
• Strong post-pandemic recovery: 2023 exceeded 2019
• Europe dominates: Italy leads with 517 events
• 761 unique cities worldwide
• Typical planning horizon: 138 days — the median lead time for marathon registration

And what we cannot measure well: how many events never got listed, how many dancers travelled where, and everything the Facebook-group scene never put on a website. The data is a shadow of the scene — a consistent, growing shadow, but a shadow.

The Deep Dive

This post is the taster. The full report — interactive Plotly charts, the interactive map, quarterly breakdowns by country, seasonality, food, duration, registration lead times, the whole methodology appendix — runs as its own self-contained page:

Thanks to everyone for commenting and providing insights into your needs, thinking, and critique over these 17 years. The database keeps growing — here’s to the next 17.

🎊 TMD at 17 — data vintage January 19, 2026, story rebuilt for this blog September 27, 2026.