You can do lots of things with VBA. For example, hide a slide on Mondays:
Code:
Sub MyRules()
If DatePart("w", Date) = vbMonday Then
ActivePresentation.Slides(3).SlideShowTransition.Hidden = msoTrue
Else
ActivePresentation.Slides(3).SlideShowTransition.Hidden = msoFalse
End If
End Sub