For the month of May, Carl Engle-Laird and Lee Harris will be reading unsolicited submissions. Check out the post at Tor here for specific details.
It should be noted that they are actively seeking works from underrepresented populations:
In addition, both Lee Harris and Carl Engle-Laird actively request submissions from writers from underrepresented populations. This includes, but is not limited to, writers of any race, gender, sexual orientation, religion, nationality, class and physical or mental ability. We believe that good science fiction and fantasy reflects the incredible diversity and potential of the human species, and hope our catalog will reflect that.