When you accept a meeting invitation, you add the meeting to your calendar. You might want to check that the meeting details are still up-to-date. To do this, perform the following steps:
Double-click on the meeting in the schedule pane, to open the Appointment window.
Choose Actions -> Refresh Meeting to send an email message to the meeting organizer. The subject of the email is Refresh: Calendar information.
The organizer decides whether to send you the latest meeting details.
Only the organizer can change the details of a meeting. Any changes made by a meeting attendee are ignored.