Hi, Diego. You posted in our Pre-Sales forum from a user account that doesn’t have any purchases associated with it.
We don’t answer support questions for The Events Calendar core/free or Event Tickets core/free or their paid add-ons in the Pre-Sales forum.
If you made your purchase(s) through a different user account, please login to that account and then post in one of the paid forums.
Thank you for your understanding and thank you for using our plugins.
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Possibly helpful references:
Note: This snippet may be what you’re looking for; it does not require any of our paid add-ons:
https://gist.github.com/cliffordp/2e5c53412171363b66864087b6a75bad