Good morning Adrien and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
is there a fix to block the number of tickets to 2? Something you could recommend me to add into the code?
Absolutely. You could either use a third-party plugin that manages just that (limit quantity).
For example, there is a ton of them available for WooCommerce.
You can apply the following snippet in the functions.php file of your theme (without the PHP tag at the top): https://gist.github.com/GeoffEW/075787fd6b427e1c47be0d756ca5b26c
Let me know how that goes.
Best regards,
Geoff B.