Two things that I would like to see:
* horizontal (landscape) mode, especially the tablet / desktop (web) version, maybe with something like timelines mentioned here
* some way of marking when beginning and end of box representing even actually falls on begin and end time (perhaps bolder lines, perhaps some shading, perhaps adding "handles" i.e. ------- to -----, etc.)
I also wonder how do you represent whole-day events.
Great work!