I tend to use my iCal to schedule due dates for various classes and assignments. I already use the alert system and sync between my iPhone and Macbook via iCloud. I'd like to use a feature that would allow me to mark a task/event as completed so I know it's been accomplished and no longer need to worry about it. I don't want to delete the task/event, nor change it to a completed calendar as it gets confusing when "Quiz 1 due" can be applied to various classes.
A check mark or something would be great. Is there an ad-on for this? Or another app that will sync with iCal and allow me to do this? Thanks!