Good evening Adriano and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
After one year, when your license expires, the plugins will still work if you do not choose to renew.
But, you will need to “freeze” your the Events Calendar related plugins to the current version at the time of expiry (all of them) and possibly WordPress too (although that might continue to work for awhile).
This is because the Events Calendar plugin family needs to be at similar versions (released around the same time) to work properly together.
Additionally, as you mentioned, you will stop receiving premium support for the premium plugins.
Let me know if that helps.
Have a great day!
Geoff B.