I have a calendar interface that indexes a bunch of gym classes for a user to pick among. These classes are represented as small boxes on the calendar, in a similar manner to how hipmunk.com does their calendar interface.
Once the user hovers over this box they see more information and the cursor turns to a pointer indicating the area is clickable. My problem is that in user testing the users rarely realized that they could hover over the boxes, and therefore never realized they were clickable!
What's a good way to indicate these boxes contain more information then visible by default?
Edit: Here's a screen shot of what the calendar will look like. Still playing with colors and these are placeholder icons (from theNounProject) but I think it gives an idea of how the calendar will look. This appears well above the fold on the page.
Upon hovering over one of these events we get (and cursor goes to pointer):