Many thanks to Mead Cain for scanning and sending these images.
The first three pictures are from Elma's "Bridal Souvenir", containing the marriage certificate and signatures of those in attendance.
Marriage Certificate
Guests: Newell L. Mead, Mrs Newell L. Mead, Mrs. John G. Semken (mother of the bride), Blanche Mead(?) Pickford, Dorothy Semken Harris (sister of the bride), Jennie K. Charles (Johanne Marie Köpke, the bride's aunt), John Kepke (Dr. John Kepke, the bride's uncle), Emilie D. Kepke (Dr. John's wife--this event took place the same year Emilie died), John Kepke, Jr. (Dr. John's son, later known simply as "John Kepke", and also as "Grandfather"), {unidentified--perhaps a young Newell L. Mead, Jr.?}, A.W.Ross (likely that this is Alan Ross, son of Dorothea Kepke and Alexander Ross).
More Guests: Dorothea K. Ross (the bride's aunt), Hermia Ross (Dorothea's daughter), A.W. Ross, Jr. (this is probably Alexander Ross, husband of Dorothea Kepke Ross), Edward T. Harris (Husband of Dorothy Semken Harris), Perry W. Charles (Jennie Charles's Son), Dorothy Harris (Daughter of Dorothy Semken Harris, and five and a half years old at this event, hence the fancy signature)
Genealogy of Kepke Family Members attending Mead/Semken wedding.