Hi marco,
I see you haven't received any response to this as of yet, but I wonder if it could be in part for the same reasons I didn't reply to it when I first saw it.... I live in the U.S. and have no association or contacts in Madrid. I also don't know the language to the extent that even if I did a Google Search I could find what you seek. I assume you are going there, and perhaps moving there (?) so I will also assume that you know the language. That being a good possibility, have you yourself tried searching through Google? I'm wondering if perhaps you had and found nothing so you came here to see if anyone knew some answers, because otherwise I'd say try Google.... when all else fails, it's not a starting point. :)
I'm seeking for any kind of professional contact in Madrid: mainly photographer agents and photo agencies but any other suggestion connected with editorial photography will be appreciated.
In addition, is there any interesting museum/exposition/fundation/association/festival concerning photography in Madrid that I should enquire about?
Thank you very much.