No, but you can verify who has access to your calendar by going into the calendar preferences and checking access & delegation In addition, if you bring up the properties box for your mail file, change the dropdown to Database, go to the second tab, and click the User Detail button you'll see read/write activity for your mail file, which includes your calendar. If PersonA doesn't have access to your mail file in general, then any entry listed is most likely them reading your calendar.

No, but you can verify who has access to your calendar by going into the calendar preferences and checking access & delegation In addition, if you bring up the properties box for your mail file, change the dropdown to Database, go to the second tab, and click the User Detail button you'll see read/write activity for your mail file, which includes your calendar. If PersonA doesn't have access to your mail file in general, then any entry listed is most likely them reading your calendar.