Hey Andre—thanks for reaching out!
I want to be frank right off the bat that, even for our paid, premium license holders, we cannot help with custom coding projects. → https://theeventscalendar.com/knowledgebase/what-support-is-provided-for-license-holders/
So our ability to help out here in the free, open Pre-Sales Questions forums is especially minimal.
While I wanted to make sure your expectations were set fairly, I’m still happy to help here—and the good news is that we actually do have a function for “updating” event data.
That method is actually part of a whole API class we have, which sounds like it’d be super handy for your needs.
To explore this API class, head to this file in your The Events Calendar plugin files:
the-events-calendar/src/Tribe/API.php
In this file you’ll find methods like updateEvent(), which seem to be exactly the sort of thing you’re looking for:

Explore that file, tinker around a bit, and see if this stuff helps. I hope it does!
Best of luck with your project,
George