Search courses and special events for YDC 2013 by selecting criteria below.New Policy Change - Preregistration is required for all No Charge courses, except High-Tech Playground, Student Table Clinics, and Student Lecture, and Social and Cultural programs. Your seat will be held for 10 minutes after the start of the course. When the room is filled, no additional people will be admitted and no standing is allowed per order of the fire marshal.