As previously mentioned, what most people search on the Internet right before Halloween are gift ideas. During the holiday season, search volume for "Halloween gift ideas" keyword and other relevant keywords amount to 10,000 - which is an enormous number.

If you have a blog on your site for content marketing, write a blog post targeting "Halloween gift ideas" keyword, then SEO it to the first page of Google (Suggested guide & tool: Moz) when people search that keyword.

When your blog post is reached by people who have the demand, they will become your organic traffic and probably buy a lot of stuff from your store, thanks to your suggestions on the blog post.