The key to editing group calendars as well as send invitations is the following.

Once you've got your group calendar showing in iCal as shown on the main hint (NOTE: You must be bound to your server's directory services and it must be functioning properly, check this with the Directory Utility)

You first need to have a personal server calendar setup in iCal > Preferences > Accounts. Do this by adding an account, enter your server shortname and password, leave the URL blank (Auto).

Setting up a group calendar for editing, all of which is done in iCal:
1) Go back to the account settings and click Delegation
2) Click the Edit button at the bottom of the sheet.
3) Add a line and start typing the users who should have write access to the group calendar. If your directory is configured properly iCal will finish typing the user's name for you.
4) Click Allow Write for each user.
5) Click Done
6) Now remove the group calendar from the iCal account list
7) Click on your account you set up previously and click Delegation
8) You should see your group in the list, click on Show
9) Exit out of Preferences

Now you can edit group calendars and add invitees.

You use this method as well to set up delegates to your personal server based calendars.

Also note that Location in an event referers to locations set up in your server's LDAP directory which can be edited using Directory.app

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