This is not the first time that dates for the upcoming major Steam sale has been leaked online and this time dates for the three major upcoming Steam Sales have been leaked these sales include Steam Halloween Sale, Black Friday sale and Winder Sale.
According to the leak, Steam Halloween sale will start on October 26, 2017, which is less than a week away from today. The sale will continue till November 1, 2017. Steam Black Friday sale will start on November 22, 2017, and will continue till November 28. As for the Steam Winter sale, it will start on December 24 and will continue till January 4, 2018.
However, take these dates has a grain of salt as these are just rumors until Valve officially confirms it. If the date for Steam Halloween sale is correct then it would be best to prepare your wallets.
However, the leaked dates for these Steam Sales are in line with last year sales. in 2016 Halloween Sale started on October 28. Black Friday sale, also known as Fall sale, started on November 26 and the Winter Sale Started around 22 December last year. So basically, all of these dates fall in-line with previous sales and might be true.