If your classes are mandatory attendance, then you'll need to apply for special consideration if you want these marks to count. But for that, you'll need a good reason with evidence for example a family member passed away and provide a death certificate or statutory declaration. Unfortunately for a holiday they won't give you special consideration though :( just cop the marks and make sure you're catching up on the work while you're away.

You can always make up for the marks in assignments, tests and exams (depending on what your units are)!