Sadly, I have been unable to locate any meaningful customer numbers for Dominoes.
But let's look at this 30% figure for a moment, and I appreciate that these are huge assumptions:
30% of customers will collect, and they will either drive or walk. For the sake of arguement let's say this is a 50/50 split.
This would give us 15% that walk, if they walk it suggests that they are local and will know about the parade anyway.
If they drive they possibly live a little further a field, and therefore may or may not be aware of the joys of HOP. Let's split this equally again, giving 7.5% of people that have driven and know the area and 7.5% that do not.
We can safely say that most pizzas will be collected at night - Can I say 80/20 split for this one?
This means that 6% of customers will come to the store at night, having driven and without any real knowledge of the area. Now granted coming at night the shops will be closed, and the lights will be off. However, you will still be able to see into the window as you walk past, but my guess is that it probablt won't catch your eye quite as much as it might have done had it been light. I reckon it is probably lightness for the "shopper" to appreciate the full impact of a shop window (say Jumping Bean or the Gallery) 33% of the year.
So we now have 2% of customers, driving to pizzeria night, without any real knowledge of the area yet appreciating what the other stores in the parade have to offer.
Of this 2%, how many will actually get into their cars and drive to HOP to experience what it has to offer? Shall we be generous and say 1 in 5 customers or 0.4%
Mark Twain popularised the expressed, there are "lies, damn lies and statistics" with this in mind I shall apply accepted rounded principles.
So we are left with no customers that have driven at night, without any real knowledge of the area but have appreciated what the other stores in the parade have to offer and have actually taken the trouble to come back for another look.