Choose Find from the View menu.
The Find dialog box is displayed
Type some text in the in the Find field that can become a keyword for the search; for example, conference.
The Find field is not case-sensitive.
By default, Calendar searches the past and future six months in your calendar. If you want to change the search range, click Search all to search your entire calendar (can take a long time) or edit the dates in the Search from fields.
Appointments with matching text are displayed in the Find window.
Select the desired appointment in the list.
Click Show Appointment to display the entire appointment.
Click Close to close the Find dialog box.