DavRob60's answer is basically right, but I wanted to take this opportunity to write up a more detailed answer that applies to more than just SciFi.
What we've done before
There are several different types of contests that tend to pop up on our sites. They often overlap, but in the most broad terms they are:
What I like to call "internal contests" ...
from : Topic of the Week Contest [Updated August 29]
Current Topic: INDEFINITE HIATUS
At this moment and for the foreseeable future, I will not be able to run any Topic of the Week endeavors. That does not mean that the site can't have Topic of the Week contests, especially since people still seem very keen on them. These can still happen, they will ...