To request that your event be listed on the NSM Events Calendar, please email firstname.lastname@example.org.
A group web calendar is like a hallway calendar--it's a very visible calendar that everyone in a group can edit. It's very good for highlighting important dates.
Because the web calendar uses iCal server, all users who have set up their server account in iCal will have synced calendars. Event changes made in the web calendar are reflected in iCal, and event changes in iCal are reflected in the web calendar.
If you sync group web calendars, the local iCal version of the calendars are read-only. Any changes you make to the group web calendars are synced with your own supported calendar but you can't edit the calendars.
The web calendar simplifies creating events and sending invitations.