Sorry if this isn't quite what you are looking for. But if you are willing to use Googles online Calendar, you can syc that with your GPE calendar using Erminig. It works great but for me there were a few kinks to work out in the beginning. The install is not hard if you go directly to the developers web site for the needed files. There are a half dozen pretty easy steps to get it installed. Of course you then need net access to syncronize.

Neil