Colleges and universities are learning to work with a new breed of parent who stretch the first-year send-off into a multi-day affair. Dozens of schools offer two- or three-day parent-orientation sessions to get Mom and Dad comfortable with everything from housing to campus security. And according to University of Minnesota surveys, 74% of 193 responding institutions said that this year they were hosting parent receptions on move-in day, up from 7% in 2003.