I recommend using a tool such as Firebug, which allows you to select the elements of interest by mouse and shows you an Xpath expression for the element(s). Firebug also allows you to inspect the classes of the elements.
inspecting one element, I see class="fc-event-title" - that might already be enough to find the elements that contain the event description:
X:\repos\WWW-Mechanize-Firefox>perl -Ilib -w examples\scrape-ff.pl htt
Spanish I A Days
Mi Familia- Oral presentation TODAY!!! Spanish I B days
Mi Familia Oral Presentation TODAY!!! Spanish I A days
Spanish II Chapter 3A Quiz
HOLIDAY (Memorial Day)