Is there a way to be notified of a given calendar event until I explicitly dismiss it?

Per-event calendar notifications appear not to have the option of audible/haptic alerts that persist until dismissed. Is there a way to create this feature? As a person who irregularly reads notifications, I'd like to enable selected events to nag me until I acknowledge them so that overlooking key things on my schedule is harder to do. If this feature exists already, how do I enable it for a given event, esp. for notifications on the watch?