i have a doubt on first task of case study 2 of project 3

i have a doubt on first task of case study 2 of project 3 Case Study 2: Investigating Metric Spike Weekly User Engagement: Objective: Measure the activeness of users on a weekly basis. Your Task: Write an SQL query to calculate the weekly user engagement. My first task in this project is mentioned above for your reference. I have a doubt in this task. do i need to calculate how many events are happening each week?