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Hello tango afficionado,
I think you would be interested in KnowTango.com -- the world's first wiki-tango map where anyone can add or edit events.
If you see an event that has wrong information or is missing, make sure to fix it. The site is totally free with no ads, so hopefully it's something our worldwide (and your local) community can use and enjoy :-).
Take a look and let me know what you think!
-Henry
Henry