This post will tell you what a delegate is, how to get rid of it if you need to, and how to get your ical and iphone to be properly in sync with multiple top-level calendars.
I just had a look at the top keywords for the last 7 days. not surprisingly there are lots of entries for ‘ical delegates’, ‘google calendar’ + ‘delegates’, ‘what are ical delegates’ etc. so, I had a look at the stuff I did with google calendar, syncing it to your mac’s ical and thought the explanation was a little poor.
first off, what is a delegate, and why should you be concerned about them:
a delegate is basically any calendar that’s not your main one. you should be concerned because if you add a google calendar to your ical then all the sub calendars apear as delegates.
so if I have a calendar named ‘work’ and one named ‘personal’ and one named ‘gigs to see’ then ‘work’ would be the main one (the main one is the first calendar you made) and ‘personal’ and ‘gigs to see’ would be delegates.
its ok, and its workable, unless you sync your ical to your iPhone with iTunes (check out how to sync your google calendar to your iPhone calendar here ).
to set up all your calendars without having them appear as delegates follow these instructions:

to get the url to use:
copy this into a text editor and make it read like:
/calendar/dav/randomstring @group.calendar.google.com/user

Repeat with each calendar in your google calendar by making a new account in ical for each calendar you have in google calendar. remembering to remove the @gmail.com part if this is not the main calendar for your account
ive not found a way to make them all appear in one ical calendar – they are all separate calendars listed down the side, but they usually come up with the name they were given in google calendars – I think the easiest way would be to go into google calendars and rename them to easy things – I have one called personal calendar, one called cycle calendar, one called ‘work’, etc. you can get them all to display in ical at the same time by ticking the small boxes – each calendar will be a different colour =)
you need to put this in the server address:
https://www.google.com/calendar/dav/
before the
randomstring@group.calendar.google.com/user
so that it looks like
https://www.google.com/calendar/dav/randomstring
@group.calendar.google.com/user
you need to do this for every calendar that you want to appear
you can move an event from one calendar to another in ical by right clicking it and going to edit. it will have calendar: and the calendar name. click on that and you can change the calendar =)
If you have the iphone setup to sync your contacts, calendars and mail from google (check out how to sync your google calendar to your iphone calendar here) then any event you add to any calendar (on your mac, on your iphone or via google calendar – or by any other method that adds the event to any of the devices) will be synced to every one of the other devices. that way I can automatically add events to my calendars from my mail.app, or by adding them in google calendar when im at work (by syncing outlook to my ‘work’ calendar) or I can add them on my iphone calendar, and they are instantly available on any of the other places!
try it and see for yourself. look at the screenshots above. you will clearly see THREE caldav accounts. if you can’t get it to work, then remove the @gmail.com part if this is not the main calendar for your account