Free Press theater critic Martin Kohn discusses Carl Djerassi's play, \"An Immaculate Misconception,\" which opens today at the Hilberry Theatre. Djerassi, who is noted as holding his first academic position at Wayne State University in the 1950's, will also participate in a Sept. 15 symposium titled "An Examination of Assisted Reproduction Through the Lens of Carl Djerassi," 10 a.m. to 3:30 p.m. at the Hilberry. It will feature professors from Wayne State 's medical and law schools and the department of sociology, and includes lunch and a special performance of the play.