Calendar filters are used to describe how you want a particular calendar to look and the data you want to inlude in the calendar. To edit an existing filter, you perform the following steps:
The Edit Filter: "Fliter Name" window opens.
You can now change the filter.
You can also change the various pieces of the filter in the tabs on the window: Views, Tasks, Theatres, Volunteer Activities, Projects, Plays, and Query (currently unused). The Publish tab lets you set up the filter to be manually (and in the future, automatically) published as a shared calendar to the Internet.