Hi Carl,
The events list view is mainly controlled by /wp-content/plugins/the-events-calendar/views/list.php – if you make any changes, make sure you make a copy and place in an ‘events’ folder in your theme. But, to change the size of titles you don’t need to edit PHP files, you can just do this with CSS. To do that you can add something like the following to your themes style.css file:
.events_list .tribe_events .entry-title a {
font-size: 30px;
}
Change that to whatever you want it to be 🙂
I hope that helps but let me know if you have any questions.
Cheers,
Jonah