When would this talk most likely be given?

If there are no more questions about the textbooks or syllabus, I’d like to briefly explain the grading procedure I’ll be using in this course.
   50% of your grade will be based on the mid-term examination and the final exam. Both of these exams will be given during class time and each will be 2 hours long. In a lecture class of this size, it is impractical and almost impossible to give make-up exams, so plan on being healthy and in class on those days; otherwise, your final grade average may suffer. The semester is 16 weeks long and quizzes will be given every 2 weeks to make sure you’re keeping up with what’s going on in class. Quizzes will count as 15% of your grade and daily homework will count another 15 %. Homework will be collected and graded by the teaching assistants in your laboratory sessions. So, 50% for exams, 15% for quizzes, and 15% for homework. The remaining 20% of your grade will be based on class participation. I’m obviously not in a position to judge this, but I will ask your teaching assistants to evaluate how actively you participate in their classes. Remember, the purpose of the laboratory sessions is to give you a chance to ask questions about the lecture and to discuss difficult points.