Get set for a terrific two-hour virtual production on YouTube. The scene is a middle-class home in St. Louis in the year 1903. The Smith family eagerly awaits the arrival of the World’s Fair the following year. Charlotte Moore, artistic director of the Irish Repertory Theatre has adapted the story (based on “The Kensington Stories” by Sally Benson) from the well-loved MGM movie and later Broadway production of “Meet Me in St. Louis,” in which Moore was a featured member of the cast. Here, she also directs. Creators of this delectable event include book by Hugh Wheeler and songs by Hugh Martin and Ralph Blane. The time, 1903, places us long before the shattering conflagrations that would throw the entire world into turmoil. Now, life is easy, without conflict. The most stressful event is the inability of young John Truitt (Max von Essen) to retrieve his tuxedo in time to …