is there a way for iCal to display appointments after they're over?

I want to use iCal as a reminder to call clients for follow ups, but if I make an appointment to call Joe Schmo on Tuesday at 1:00-1:15, but if something grabs my attention

at 12:55 and I'm stuck on the phone until after 1:15, the appointment reminder to call Joe Schmo in notifications (swipe down in iOS home screen) is gone. Is there a way to keep that alert in notifications until I clear it manually?

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