Tango-tradicional.de

http://tango-tradicional.de/ site maintained by Thorsten Zörner.

It says

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Ihr geht am liebsten zu Milongas, bei denen ausschließlich traditionelle Tangos, arrangiert in Tandas und Cortinas, gespielt werden? Auf dieser Seite seid Ihr genau richtig!

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Translated roughly to:

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You prefer to go to milongas that play only traditional tangos, arranged in tandas and cortinas? On this website you are exactly at the right place.

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The site states proposals for new entries to the list can be send by email to the maintainer of the site.

Note:

• It is not sure whether the organizer of the events are aware of the fact that their events are included, and it is not sure they ever advertised their event as "only traditional". That means, people may report new entries because on one night a milonga was 100% traditional.
• It is also not defined what individual people classify as traditional.

Helpful would be listing of past events like on http://www.chrisjj.com/tango/cjjsets/