The portfolio archive utilizes the standard way of templating WP archive pages. https://codex.wordpress.org/Post_Type_Templates
So, given that, the portfolio archive uses /kleo/archive-portfolio.php. You can copy that page to your child theme and change the name to archive-event.php (or events, not sure what your CPT is called).
You will see that the code in that template is very portfolio specific. Helping you change it for Events is beyond the scope of support here. So you’ll have to do it yourself or hire someone to assist.
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