@Sarah12
With giving the winning team 200 free points each you are already basically giving everyone a free story post. The double points for reviews on review day would get a good draw.
Another idea would be some volunteer work. For example, if we have any artists, perhaps a free cover design for the most review points of the day.
We could also do something like the spotlight. There was a site that has closed down that would periodically do a sort of interview of a writer with some generic questions. Things like, "What made you start writing?", "What was your favorite book growing up?", "If given the chance would you become a published author?" Sort of get to know the writers with an announced piece about themselves. This could be a prize to the reviewer with the most points as well.
Gender:
Points: 487
Reviews: 107