I have some suggestions where you great plugin could be improved with some better html standards. W3C validator throws errors on the following divs
<h3 class="ai1ec-date-title"> <div class="ai1ec-month">Mar</div> <div class="ai1ec-day">10</div> <div class="ai1ec-weekday">Sat</div> </h3>
A h3 tag should not be used here. It would have been better used to wrap the event title.
If you where to use h3 tags here the should be inside the div. Dont have divs inside the h3 tag.