The units and weeks feature allows an organisation to add curriculum layout placeholders that divide each curriculum period (Year 1, 2, etc.) into weeks, e.g., Week 1, Week 2, Week N, and assign events to those units in each course. To facilitate this, certain settings have to be in place in the software. If you are not seeing weeks or unit options and you think you should be, please ask a developer at your institution to check the settings table and make sure weeks is enabled.