At the entertainment in Brandel's Hall and Summer-Garden on West Randolph Street, which will be held to-morrow afternoon and evening, the following have declared their willingness to co-operate: Mr. Oscar Schmoll, the pianist, Miss Blumenschein, the singers Miss Augusta Leder and Miss Wertheim for the afternoon, while the Orphens-Men's Choir under the direction of Mr. Ehrhorn, the tenor. Mr. Mussen and Miss Laura Kurz will participate in an evening performance.