Good evening Julien and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
I would like to know if is it possible to limit Tickets for users per events.
The short answer is that this is possible because we hand-over all of the transactional aspect of things to WooCommerce for our Event Tickets Plus customers: https://theeventscalendar.com/product/wordpress-event-tickets-plus/
So basically, you will need to use a WooCommerce plugin that lets you limit purchases per user or more specifically, per user group/role: https://wordpress.org/plugins/woocommerce-incremental-product-quantities/
This works because after all, tickets are nothing more than WooCommerce virtual products.
Let me know if that helps.
Have a great day!
Geoff B.