You can change meeting information that is on your calendar even if you are not the organizer. For example, you can move the meeting to another calendar, mark the message as private or public, add some notes to the text field, or change the reminder time.
Right-click on the meeting to edit and select Open.
The meeting details are displayed. Click Edit.
The Appointment Details page opens. Make your changes to the meeting information.
Click Save to save your changes.
If the organizer updates the meeting after you edit it, your changes are overwritten. Edits made to change the reminder time and moving the meeting to another calendar are not overwritten.