If you were only going to pick one day, I would vote for Saturday. Lots of people work during the week, so I don't know why anyone would hold a yard sale on a Thursday - you would cut out a lot of potential customers that way. I loved to go garage sale-ing when I was working but could only go on weekends. When I worked most of my jobs I would get paid on Fridays, the last place was strange and paid on every other Wednesday. But hubby is military, so his paydays are 1st and 15th of the month. If you are near a military base then maybe try to plan for weekends around those dates and you might get more sales too. And make sure to advertise! If your newspaper charges too much (ours is like $40), craigslist has a garage sale section that I have heard works really well and is free. I will be trying that this week coming up to advertise our sale. Good luck with your sale! :)