Evenin' all

I'm using OLK 2003, SP3 under XP Pro. I sometimes "pencil in" the same
appointment for several dates, all but one of which are cancelled when the
rest of the gang agree on a date. This is done manually: none of my
colleagues are Outlookers. Is there a way of making a conditional
appointment, then having all but one of the dates disappear when one is
confirmed?

TIA

John