I can't find anything on that, but it is scheduled after the expiration of the Basic Agreement.
The Winter Meetings are put on by MILB, though, and now that MILB is effectively no more after the hostile takeover by MLB, it's possible that may have something to do with a potential cancellation. However, since minor leagues would still plow forward after the CBA, the job fair portion would still be a of benefit to fill the roles needed.