(By Steve Lyttle, slyttle@charlotteobserver.com) We note the passage of time in different ways - the passing of seasons, birthdays ... or, for some, school years.Thursday marked the end of another school year in Charlotte-Mecklenburg, and as has become custom, Margaret and Hardie Steitz invited Rama Road Elementary students, teachers and other parents to their home for Margaret's End-Of-School Cake Event.