Summary: Constructed Languages Stack Exchange will begin the nomination stage for a special election on September 20th to bring in one more moderator.
For full details of the process, see the announcement on Meta Stack Exchange. The timeline:
On September 27th, if there are two or more candidates, we'll run an election. If not, I'll extend the nomination period for a week. If, at the end of that extension period there are still less than two candidates, I'll simply appoint the candidate. (There's a small chance we'll need to remove a nomination, but I doubt that will come up.)
If there is an election, I'll announce the results on meta on October 5th (or October 12th, if we need to extend the nomination period).
If you have any questions about the process, please stick them in an answer here.