The Queer Tango Festival Berlin Takes place in Hasenheide and Urban Strasse, Kreuzberg on the weekend 26–29 July. A Beginner-Package for 40€ gets you 3 x 1½ hour intensive lessons over three days from Lucas de Buenos Aires.
They say "Last year’s premiere in Berlin was a great success. More than 200 registered participants from all over the world came to Berlin to dance tango, to learn, to meet friends and to make new contacts. The workshops were booked out, and the evening activities and Milongas were well-attended." Lots more here.