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To manually update the published copy of a calendar, select the calendar in the Calendars list, then choose Calendar > Refresh. If someone has subscribed to your calendar, they can choose Refresh to update their copy to include your latest published changes.

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To automatically connect to the Internet to publish changes to your calendar, select the calendar in the Calendars list, then click the Info button in the bottom-right corner of the iCal window. In the Info drawer, choose "after each change" from the "auto-publish" pop-up menu.

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To manually retrieve updates to a calendar to which you've subscribed, click the name of the calendar to select it, then choose Calendar > Refresh (or Refresh All). You can also choose to retrieve updates to the calendar automatically by choosing an item from the "auto-refresh" pop-up menu in the calendar's Info drawer.