Calenders are hard to find for Joomla - good ones espacially. This is my favorite, but it has many limitations. To mee, its mostly lacking ways of displaying events. I can chose a monthly view - but not choose to see items from one category in that monthly view. Actually all views are boring lists, except the monthly one - that shows all items, disregarding categories. And thats just one example.
But still. I haven't found any better component, so I live with the limts.