Allow to set reminder for ics calendar events

Currently, if I subscribe to an online ics-calendar, there’s no reminder for the event. And I can’t set one.
It might be so, that the calendar maintainer has not set a reminder. But, on web calendars, subscribers have their personal preferences for reminder timings.

I would like to be able to set a default reminder time for each calendar, and to be able to modify the timer of each event.

Quite much related to Birthday calendar reminders.