* April 29-30, Wednesday and Thursday -- About 6,500 high-school students and their parents are expected to explore college enrollment opportunities at the Sacramento National College Fair at UC Davis. They will be able to meet with representatives from about 175 colleges and universities and to attend workshops on financial aid and scholarships, as well as on SAT and ACT testing. The fair will be held in the university's Recreation Hall from 6 to 8 p.m. on Wednesday and from 9 a.m. to noon on Thursday. It is being sponsored by the Western Association for College Admission Counseling. Web site: .