There are two ways to search your calendar.
The primary way is to use the calendar’s search box in the top right hand.
Once you hit the search icon, the full search dialog would open along with the results if you have already entered a keyword.
Learn how to use search operators to get more specific search results.
Another way to search the calendar is to use the List View with Show details checked, then hit Ctrl-f (Cmd-f on Mac) to bring up your browser’s search box. Enter the keyword and hit search. The results appear as highlighted key terms within the text blocks on the screen. You can search up to one year at a time.