Why is the Fezziwig party important in a Christmas carol?

According to Wikipedia/Fezziwig: "Mr. and Mrs. Fezziwig are characters featured in Charles Dickens "A Christmas Carol". Mr. Fezziwig is the proprieter of a warehouse business for whom Ebenezer Scrooge worked as an apprentice; and in Stave 2 of The Christmas Carol, has a Christmas ball, where Scrooge meets his love of his life, Belle. The character is a happy man with a large Welsh Wig. Old Fezziwig liked to dance to "Sir Roger de Coverley", a lively tune of the 1800's." Fezziwig has three daughters, "beaming and lovable."