Two reasons for "before I go away".
The first is to get a Start Docket if it's a FarRide or IBA ride.
The second is because, Like Marcus, when I'm headed for home I'm not interested in stopping.
BUT, like Pete, I'll sometimes fill the evening before a big ride, especially if I have a big-value docket about to expire or if the price is so low I think it might go up overnight.