This is not an organized meetup, organize yourselves in the comment section if you like to attend the conference together! Learn more about the conference and, as may be the case, registration, at
I have not researched the speaker's positions any further, but if you're curious about Austrian monetary theory, take a look at Menger's Origins of Money:
Don't be shy, all it takes to understand it is some curiosity and common sense.
The same holds true for the Austrian account of why we keep on suffering from recurring "booms" and "busts," which is explained well in The House that Uncle Sam Built, with special reference to the Great Recession of 2008:
Since I won't be in Madrid at the time, I wish you an interesting conference!