Seems like a perfect fit: Speculists entering speculative fiction contests. Here are two that caught my eye:

1. ReadingWriters Sci-Fi Contest

"The year is 3037 and, despite the predictions of environmentalists,human beings still thrive on planet Earth. What's it like? Transport us to a day-in-the-life of one character."

2. We Burned So Bright - Energy/Culture Transition Short Story Competition

"To mark the peaking of global oil production, we are seeking short stories of up to 3000 words set sometime in the near future, exploring the society you live in now, where oil is becoming - or has become - too expensive for everyday use. We want you to use your imagination and knowledge to explore the energy-culture transition. It can be in any genre and in any style. Stories can be positive as well as negative!"