Hey Gosia!
This is indeed technically possible, though not something that is included by default with The Events Calendar. So, the complete process of building a Google-Maps page with all the venues populated on the map is something you’ll have to take the reins on, but here at least a few pointers to hopefully help get you started:
First, the easiest way to get all the venues on your site is to use the function tribe_get_venues() – this function returns a list of venues based on some default settings, but if you want more control of how many venues are retrieved, you could always write a custom WP_Query for the tribe_venue post type. Learn more about WP_Query here.
Then, once you get the Venues, you should be able to get their locations by using functions like tribe_get_address(), tribe_get_city(), etc. – you can find all of these functions listed in the file at /the-events-calendar/public/template-tags/venue.php.
The next step would be combining all this data with a Google Map, which is trickier to do and something a bit beyond the scope of the support forums here. But one suggestion is to read through how Events PRO does this for the “Map View” of the plugin – you should be able to copy large chunks of the code from there and implement things into a custom page template after some experimentation.
I hope this helps!
Cheers