I like this one:
k5n.us: WebCalendar Home Page
Dunno if it fits your needs.
Hello, I'm trying to find decent open source calendar script for a friends website. What I need is some basic "Events Calender" that he can easily update. Its for a bar/grill so does not need to be falshy. Ideally something like the calendar that is in VB. However, he does not use VB with his website and I believe that calender is a module specifically for VB?
Anyway, I am open to suggestions. Thanks!