Hello:
I've been there, the ticket costs 10€ and there are no discounts. Marklin had a stand dedicated to My World and the most basic entry packs, also something for kids to play with. Almost everything was dedicated to the 2 rails and the N scale. There were some stores with 2nd hand material all non-Marklin except in one of them that had 4 or 5 Marklin locomotives. The most interesting thing was the modular model of AAFM (Asociación Amigos del Ferrocarril de Madrid, Friends of the Madrid Railway Association) in marklin H0 and with a demonstration helix in one of the ends, although they had some problem the trains were working.

There were also several modular layouts of 2 rails in H0 and N, although some were very realistic and ambitious the truth is that its operation was not very effective. A morning to share with friends and little more. I was able to speak with Mr Lutjens (importer of marklin in Spain) and he answered my questions or queries very kindly.

Some videos
5" Train


2 rail modular layout


Marklin system modular Layout


Best regards