photo and video website

I want to reform my client’s site (http://lentracte-sens89.fr/) by simplifying it on the one hand (several pieces of information are useless), but above all by completely rethinking the “event” part. This is an area that shows past evenings / shows and the photos and video that may have been taken.
If I submit this request to you, it is because I realized that when a template pleases me and meets my expectations, I realize, once purchased, that the page which seemed to me to correspond to my expectations (in grouping photos and videos, as in this example http://preview.themeforest.net/item/redfolio-a-responsive-onepage-wordpress-theme/full_screen_preview/7854339?_ga=2.18478393.1855380578.1592239438-442329828.1573468368) is built by creating articles or at least, not as easily as I thought.
In short, probably a little confused, I sent you the link to what exists so that you can better understand my expectations.
I hope for an enriching feedback from you.