Hi Kiran,
it was a jQuery Chosen between GD plugin & my current theme “Clubix”.
I change the theme and now it works.
But now i need a new Custom Post Type , because in the Clubix Theme there was a default Custom Post Type called “Artists”.
So i create one, called “Professionisti”; i need to create a custom field (multiselect) that connect the Event to “Professionisti”.
For example:
I add a new Event called “Summer Festival 2017 – Rome”, i add 3 “Professionisti” (Artist)and when the article shows the event, it will show the details of the artists participating in the related link.
Thanks
Marco