You’ll need to modify some of the CSS for the event titles and containers for events. Here are some examples of things you can change that will make a difference:
#tribe-events-content .tribe-events-calendar div[id*="tribe-events-event-"] h3.tribe-events-month-event-title {
font-size: 11px;
}
.events-archive.events-gridview #tribe-events-content table .vevent {
padding: 6px 1px;
}
That should get you moving in the right direction. Let me know if you need anything else.