Miss Mildred E. Sommer of 276 Sixth avenue and Norman F. Wiss of 171 Fairmount avenue, whose wedding will take place tomorrow night in the Woman's Club of Orange, will entertain the members of the bridal party at dinner tonight at the Robert Treat Hotel, after which there will be a rehearsal of the wedding. Rev. Dr. William Y. Chapman, pastor of the Roseville Presbyterian Church, will perform the ceremony, which will be followed by a reception and dancing. Covers will be laid tonight for the parents of the young couple. Mr. and Mrs. Bertrand H. Sommer and Mr. and Mrs. Frederick C.J. Wiss. Mrs. Clifford Jenkins of Brooklyn, who will be maid of honor; her other attendants, Mrs. J. Robert Wiss, sister-in-law of the bridegroom-elect; the Misses Madeline Atwater of New York, Lillian Reininger of Orange, Alma Seiler and Elsie Baum of this city, Harold Moore of Brooklyn, who will serve as page; Frank L. Driver Jr. of this city, who will be the best man; J. Robert Wiss, Jerome B. Wiss, Alfred Seiler, Arthur P. Sommer, brother of the bride, and Jesse Wike of Roaring Spring, Pa., who will act as ushers.