Quite a commonly known practice when 'arranging' something is to not really arrange it at all. For example, some girls are characteristic flakers, they have an inbuilt uncertainty that means they are terrible at making social decisions, especially if they feel like social 'obligations'.
The way most PUA's try and prevent girls from flaking is something like this: (directly copied from a text of mine):
"On saturday, I'll be in town at circa 2pm, so let me know if you 'happen to be there' too..
"This example worked very well, in fact, she actually arrived and texted me half an hour earlier due to the way I'd linguistically expressed this, giving me the power of being 'the pursued' making her 'the pursuer'. If you want to go into darker territory, this can also be a way of arranging more than one meeting in one day, decreasing chances of flaking in abundance.
If a girl still doesn't show up, then you, as the 'pursued', simply think she failed in trying to impress you, and move on to the billions of other women in the world.