you get invited to the sale by spending a certain ammount of money at Aritzia stores throughout the year.

For some it could be enough to get them invited to the sale from the 23 - 28th, for those that spend more they are invited to a pre-pre-sale from the 20th -28th and given a free gift with their purchase.

I used to spend under $300 per year at Aritzia, and then I would be invited to the later sale.
Now that I spend around $1000 their per year I am invited to the pre-pre-sale.

The stuff available at the pre-sale(s) lists items that will go on sale later at the end of the month, available for the public. There are specials however that will not be on sale for the price given at the pre-sale, such as the True Religion Joey Jeans for 199 from 275.