This beloved musical follows the middle-class Smith family in anticipation of the arrival of the 1904 St. Louis World’s Fair. Garland debuts standards like “The Trolley Song” and “Have Yourself a Merry Little Christmas,” while director Minnelli’s ravishing mise-en-scène evokes an era gone by, including one of his most spellbinding set pieces: the fantastical Halloween sequence as seen through the eyes of young Margaret O’Brien.