When I view an event (by clicking on the event in the calendar), the event post is shown flush against the left margin.
Viewing in firebug I added padding:20px to #tec-content and that gave me what I wanted.
Per the instructions in the readme file, I created a folder wp-content/themes/mytheme/events and added a file: events.css file with the updated #tec-content to the folder.
This didn't help and in fact, seemed to kill the css altogether. The event post was now shown with no styling at all.
I then copied and pasted the existing file events.css to the new folder and that did not change anything.
What did I miss? Where should I put custom css?