This recipe is very fast, and most of it needs to be done near serving. But, you can slice the scallions, rinse and dry your olives, crumble your cheese and measure your dry ingredients the day before, if desired.
If you want to make this when you're get home from work, give yourself a head start: measure the chickpea flour, sumac and salt into your mixing bowl and cover. Set out a liquid measuring cup for the water, a tablespoon for the olive oil and your oil. You can have this mixed together approximately 1 minute after you walk in the door. (Then, take off your shoes.)