That might work in theory, but it also might keep a buyer from buying before that date, because in general people hate to think they barely missed a sale (or paid more just a few days earlier).
On the other hand, they might put the item in their watch list, and then forget (or be very busy that day) and miss the 24th sale all together. I guess it can't hurt, but it seems (and I'm thinking purely as a buyer) that unless you are offering a 'pre-sale' discount, it makes more sense to just wait until Ebay promotes it. But that's just one persons opinion...for what that is worth 😉 Hope your promotion brings lots of sales!
