This would make a great procedure (Harry Wong). Count to five or hold up one finger at a time when the class needs to refocus. Discuss what occurs for each number at the beginning of the school year and eventually the reaction will be automatic.
"Check Out the Lineup in." Using a T-shirt theme and hanging student shirts along a clothing line is a colorful idea for a Back To School bulletin board display. You can also have the children decorate their t-shirt