So I played around with the calendar code...
There were two main things the current version of Easily Simple Calendar just couldn't handle:
1) Multiple calendars on a single page. (Brian: Multiple calendars on the same page are possible with the current Version. However, multiple CSS files aren't supported because of CSS standards compliance.)
2) A larger calendar with events listed right on the calendar itself.
I've managed to tweak things enough and my version now supports multiple calendars on a single page using different CSS files, yet the exact same data.
A larger version of the calendar is shown that offers an expanded view of the small calendar that is the default.
Feel free to have a look and let me know what you think!