As you know, the Preliminary Round of the Presentation Contest is this week, in four sessions on Wednesday and Thursday afternoon (11/12 May). I have already notified you of your required attendance depending on your class.
However, there is also a Final Round which all students in my class are required to attend. This Final Round is on Monday, 23 May at 6pm in IH267.
Unless you have a serious schedule conflict, you are expected to make allowances for your attendance at this event. You will need to have a very good reason not to attend.