Create a quiz and offer it on your site.
November 29, 2016
Write a free e-book on a topic in your niche and offer it for download.
November 29, 2016

Give promotional offers on your site.

Think about various incentives such as contests, secret sales, promotional offers, scholarships and awards to give your readers the chance of winning something (even something very small) which is also recommended to get a link or spread the word for you.