Instead of having a “back to school” sale, have a “Celebration of Steve Martin's Birthday” sale... one of my most successful sales was an ”Andy Gibb's Birthday” sale.
Edit for content, and color correct your images before uploading... displaying fewer, properly toned images, will always result in a larger number of sales than displaying all of your images, in their non-corrected state.
Send all of the bridesmaids a $25 credit voucher to help get them started. They always order much more than this, and you may even get a new client out of it.