Suggestion (not a bug):  In Events, when invitations are emailed to attendees, give them the ability to RSVP that they "Cannot Attend".  That way, they won't get annoyed by repeatedly getting reminders for it.  As it currently stands, such people email ME in response -- but then I would have to go log into Hub, locate their record, and manually change their status -- a giant waste of time, that could instead be automated by allowing them to say No in the first place right at the source, on Hub's rsvp page.