Gameplay won't move past a certain time

@Sherryist  The issue can only be fixed in a patch, so yes, the currently available approaches are technically workarounds, not fixes.  However, the game is far from unplayable.  All you need to do to avoid the issue completely is not have Father Winter as a tradition for Winterfest.  The rest of the game plays fine.

@Sherryist  Apparently you have another issue then.  However, the game is not unplayable.  It works fine in most circumstances, for most people.

If you're seeing an issue that's not related to Winterfest and would like help troubleshooting it, let us know.

@Sherryist  Your game isn't an anomaly, in fact the large number of male sims is indicative of the Father Winter issue.  You said you deleted the Father Winter tradition and that it didn't help, so I thought you meant you did so before Winterfest, as the post I linked suggests.  That's the entire point—the excess spawning drags down performance, the excess sims bloat the save, and a given save runs badly even after the holiday is over.  Removing the tradition after the fact won't do anything, since the sims already exist.

Since you have MCCC, try deleting those excess sims and see what happens.  Or don't, and revert to a save from before that particular Winterfest.  Or start a new save.  Whichever way you approach it, the modified save or the new one should not be unplayable, just as it isn't for the vast majority of people playing right now.