Hi Karim,
Thanks for reaching out to use here.
Just to be clear, do you mean the two titles on the events page at http://dsmadridnew.com/calendario/?
If so, are you trying to hide the title that I drew a red arrow to in this screenshot? → https://cloudup.com/ce9LJAdV62h
If that is the title you are trying to hide, you can do that by adding the following bit of custom CSS to the bottom of your theme’s style.css file, or by creating a child theme link:
h2.tribe-events-page-title {
display: none;
}
Let us know if this helps!
George