We may earn a commission from links on this page.Did you know you can customize Google to filter out garbage? Take these steps for better search results, including adding my work at Lifehacker as a preferred source.Target is no stranger to competition with Amazon sales. They've overlapped their Circle Week sales with Prime Day many times before. Since October Prime Day is around the corner, Target has just announced its own sale for October. Here are all the details you need to know.What is Target's Circle Week?Circle Week is Target’s name for its biggest sale. As the name suggests, it lasts a whole week, and while it used to happen just once a year but, it now occurs multiple times a year. The most recent sale was this summer, and before that, in the spring, overlapping with Amazon's Prime Day and Big Spring Sale, respectively.When is Circle Week?The next Circle Week will take place from Oct. 5 to Oct. 11. That means it begins two days before October Prime Day, which runs from Oct. 7 through Oct. 8.Do you need to be a member to shop the sales during Target Circle Week?Like Amazon's Prime Day sale, you will need to be a Circle member to take part in the sale, but unlike a Prime membership, Target Circle is free. You can sign up for an account on the Target app or Target.com.You can also pay for a Target Circle 360 membership, which grants you early access to the sale as well as other perks, like same-day delivery. If you're a teacher or student, you can save 50% on the one-year Circle 360 subscription through Sept. 13; otherwise, it starts at $10.99 per month. But again, a paid membership isn't necessary to get all the best Circle Week deals.What deals can I find during Target Circle Week?Circle week will focus on apparel; home products like kitchen appliances, storage, floor care, and bedding; fun and entertainment; and Halloween costumes and treats. You'll also find tech products on sale, which we'll be covering as usual. You can shop in person or online, and there will be a "Deal of the Day" for every day of the event that will start at 40% off.While Target hasn't released a list of deals you can expect, you can get a pretty good idea from past Circle Week sales. Here are some of the deals they had at the tail end of the Circle Week last fall.What competitors are also offering sales?Amazon’s October Prime Day will take place from Oct. 7 through Oct. 8, so all the other sales tend to revolve around these dates. Walmart will likely have its Walmart Deals sale, like they've done in the past, and Best Buy will likely have its own sale as well. I'll cover the details of those sales as they are released.