Oh No!
I can help out with this, no reverse engineering needed just Firebug.
Try out this css:
.tribe-mini-calendar-list-wrapper .hentry.vevent.type-tribe_events {
margin: 0;
width: 100%;
}
.tribe-mini-calendar-list-wrapper h2.entry-title a {
font-size: 2.6rem;
}
Add that css to your theme’s stylesheet or through a plugin such as Simple Custom CSS.
You can change the font size from 2.6 to something larger or smaller based on what you are looking for.
Let me know if that helps.
Thanks