The Feast of Tabernacles begins on Monday, September 20th, as the sun goes down. That means that the first Torah portion will be the Sabbath after the Feast is over in eight days. The posts for that Torah portion will begin the Sunday before that Sabbath. Each Torah Portion will be the same way, with the post beginning the Sunday before and going through the week. Just to be clear, the first post for the first Torah portion will be on Sunday, September 26th during the Feast of Tabernacles. All the posts during that week will be for the first study on Sabbath, October 2nd.
Enjoy the Feast, and get ready for Bible Study!