If you need a custom schedule, that doesn't start over each week, you can check the 'rotating schedule' box in your Calendar Details. 

Identify how you want each day labeled on your schedule (e.g. days of the week, A-F, 1-6, etc) and click on the plus sign to add any additional days.

Click on the checkbox beside any weeks you will not see students. Click on any individual days that you will not see students, turning the date from green to gray in the calendar. 

Save your changes and double check your schedule on the Agenda page to make sure it looks accurate. Make any changes as needed and you should be all set!