Good evening Gianpietro and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
As a first step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
As per your questions, since I do not know for sure what e-commerce plugin you are using at this point, it’s hard to give a definite answer.
But, assuming you are using WooCommerce (the most popular solution), the answer is yes to every question.
1. is it possible to link title of the event to the detail page of the event?
This is a bit outside of the scope of our support, but there are plugins to tweak the cart/checkout page + each WooCommerce page has a template that can be modified to your liking.
In short, it will require a bit of customization on your end.
2. is it possible to set a progressive discount when buyng more than one ticket for an event that belongs to a specific event category? e.g.:
Once again, this will depend on the e-commerce solution you have opted for.
In any case, this will be handled by a third-party plugin such as: https://wordpress.org/plugins/woocommerce-bulk-discount/
Let me know if that helps.
Have a great day!
Geoff B.