The entertaiDtnoiit season will be openedatthe Grand Opera House, Tliursiliy (to-morrow) evening by the inimitable Gu8 William?, iu iis great play "Oh! Whata Night!" whicli is a ncw piece, written especially for lilm by George Hoey. The costumes worn by tho lailies in tliis play have all been imported by Mr. Williains from Worth, of Paris, and are elegant in the extreme. In tliis play Gus Williams stiatains his oldtime reputatiou. He introduces several ncw comic songs and gives a recitation entitled "A Lock of Halr," which descends from the pathetic to the ridiculous In a way ta convulse with langliter the most sédate listener. Miss Topsoy Venn tenders a a couple of gohjrs In a pleasing marnier. The paintiqgt " Stranlog a Battery at Vicksburg," and "General Grant," wcre ou exhibition at Fireinan's Hall several dejn the ]ast week, and have elicited universal favorable comment. As worksof art they are certainly raeritorious, and wheD the scènes are all completed they will form a grand panorama of many of the Xn"tere8t"'g 8Cene80ftlle K"-eat re"Oh! What a Night!" to-morrow evc.'iing at the opera house, by Gus Williams and troupe.