Vitorio and myself have been working if a addon that will help us plan instance runs and later raids. The addon is called GroupCalendar. With this addon you are given a calendar display that currently allows everyone in the guild to add new events.

This addon also has an option to export to the website. Long the left side of the page you will see a new link call Group Calendar. Clicking here will take you to the new Group Calendar webpage.
I encourage everyone to grab a copy of this addon and we can then start using it.

Download Here