piCal from GIJOE's works every well on 2.0.13, 2.0.14. 2.0.15 AND 2.2.3/4. It may take you some time to set it up properly, but it's a great (and actively supported) module.
Good luck
[size=x-small]If God is watching us, the least we can do is be entertaining.[/size] Graphic Worx : Xoops Themes