Hollywood Knowledge: Tonight the Northwest Screenwriters Guild hosts a talk with special guest actor/screenwriter Walter Dalton. Dalton has written for TV (Laverne and Shirley, Barney Miller, Benson) and appeared on it (Rhoda, Mork and Mindy, Northern Exposure, and Millennium). He'll discuss a Hollywood career's ins and outs, then hang around for a Q&A session. Saturday he'll lead a workshop on pitching. Friday 7-9pm, Saturday 10am-2pm // NWSG, Clear Channel Bldg, 351 Elliott Ave W......