Ah, ok.
So there are a couple of options to explore here.
The first is to visit the Events > Settings > Display admin screen and adjust the template setting (if you are currently using ther Default Page Template, try switching to the Default Events Template, for example).
The second is to edit your site’s wp-config.php file and add:
define( 'TRIBE_MODIFY_GLOBAL_TITLE', true );
Which might also resolve this for you, however do bear in mind that – depending on your template setting as above – it may also impact on the actual page title (in the sense of the title commonly displayed in your browser tab).
Let me know if either of those help!