ostentenacity

Whoops. Answered my own question. For anyone who had the same question as I did, Ceres locations can be toggled on in the campaign settings-- there's no campaign set entirely on Ceres.

I thought I recalled seeing that Ceres was added as a campaign location after the release of the Ceres Initiative DLC, but I have all the DLC installed and Ceres doesn't show up as an option when starting a single-player campaign. Is this on purpose, or an error?