ACE Walk-In Schedule Walk-in hours and appointments are now open for the classes under our "Courses" tab. ACE provides daily walk-in hours specific to courses on a first-come, first-served basis. Tutoring may be one-on-one or in a group depending on student traffic. During walk-in hours, tutors are only available for the scheduled courses and times listed in the calendar below. If you would like schedule an appointment outside of the walk-in hours for your course, visit the appointments page.