There is an event plugin called Ajax Event Calendar that I use quite often. I currently have AEC version 1.04 installed which was updated on 2012-12-18 and I have Pagelines 2.3.8 installed.
AEC has a modal event description that shows up when an event on the calendar is clicked. If the Pagelines theme is active the modal halts after going dark and the event description does not show up.
Here is a link to an example: