Hi Nathan Greener,
You can remove the gap by modifying the padding associated with the description text. In your case, you could try adding something like the following to your CSS (I'll explain how I found it below):
padding: 0 !important;
If you right-click and select Inspect over the Calendar widget, you can scroll through the HTML elements and see the associated CSS on the right. As you move over the element containing the description text, you'll see the following:
Visually, this shows that the text is in a division that has padding (pushing it in from its parent; the green box). So, the code I provided selects the division with the "ig-widget-calendar" class and sets its padding to 0. This should move the title and description closer together.
Hope this helps,