Over the past few years I’ve seen these primarily done for romance. There are
romancebooklovers.com and a few others. Usually these websites organize it, but I’m sure a band of authors could get together independent of these sites to put this together. What is nice is these website index the books by tropes, by sub genre, free or 99c.

Each group will have a method for signing up.

I did one through Indie Author Central: https://www.indieauthorscentral.com/

Nailbiters: https://1mkwilliams.com/about/

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