Tutorials are designed to complement lectures. As you know in lectures, lecturers present info/theories/principles to hundreds of students. During the lecture there is usually very little opportunity to discuss or question what the lecturer says. Tutorials are less formal than lectures and are conducted in smaller groups. It provides an opportunity where students can clarify and extend, through readings, discussions and other activities, what they learn from the lectures. Tutorials give you the opportunity to ask questions about the information presented in the lectures and clarify issues related to the course. You can learn from hearing other perspectives and you can use the other students to test your ideas. This means that tutorials can save you study time and help you to
prepare for assignments and exams. Wouldn't recommend skipping out on your tutorials. And like what Fyrefly said above, most tutors mark you on attendance and basically you can fail if you don't turn up to your tutorials.