Add ability to record RSVP as a NO
We use Events to see who is coming to a meeting. We need to know who is definitely not coming as well as those who are coming. Not being able to record a NO for RSVP is confusing to many of our volunteers. A negative RSVP should be for the whole event and not individual shifts.

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Jerry Bohannon commented
Sending a reminder X days before the event to those who have not RSVP'd yes or no would be good. I would make it one of the check boxes under notifications. When you say "all", I take that to mean "all invited". Also, it would be good for the organizer to be able to see the list of all who have been invited. You might invite a certain list, but if the response is not adequate, you might expand the invitation list.
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Would it be helpful to add a feature that allowed the organizer to invite all volunteers to an event and request them to RSVP either yes or no to the event? and to send emails if they do not RSVP? What would the ideal feature look/function like to you?