You should be able to get it back with hood checker. Even if you can't, you can just respawn it with the batbox if you have no unlink on delete.

If it were me, I would have sent them to a different lot by accident. Try HoodChecker. It will move graves to the chosen lot, without you having to track them down.
If they still aren't there, yeah, you'll have to respawn.

What's the most reliable way to change day? It tends to change back.

I don't know any other way to change it, other than using the setHour to 23 and then waiting for one Sim hour to move forward one day... What methods are you using? @Pideli

I use the time and weather manager. Super easy and I've never had a problem with it.

I use Pescado's LotSyncTimer to change days. I ignore the warning. For weather I use the controller from SimWardrobe.

If I add an empty Downtown to a hood, will new, random slobs, divas, and grand vampires generate?

Yes, unless you have successfully suppressed or replaced the template, and unless you already have an attached downtown. If you add a downtown, it will add any existing characters in it. If you add a second downtown, it will always be empty.

But if you add a downtown, delete it, and then add a new custom downtown, and have not replaced the template in the program the files, you will get a second set of the Downtownies similar to the first. I know because I have done this.

If you add an empty fanmade downtown which was created without downtownies in it, new downtownies will start to spawn using the downtownie templates in your program files, but will not appear all at once on first load, as with a normal custom downtown. I know because I've done that, too!

Is it a common bug for a CAS made sim to just not have a predetermined hobby? I've noticed this happen only a couple times.

Can anyone explain/link a tutorial for fixing the way custom foods display on the pie menu please? I'm sick of having seventeen entries for "pancakes" only one of which is actually pancakes.

Does this still happen if you have notownieregen?

@StrangeTownChick mini-tutorial to edit the pie menus for custom foods by Bulbizarre

I'm not sure, because I didn't have notownieregen in. I believe it should work for downtownies the same way it does for townies: i.e., NPCs will be called as needed, and existing NPCs and playables will be called for walkbys, customers, and background movement instead of new downtownies being generated.

Downtownie NPCs would be Mr. Big, the Diva, the Grand Vampires, and the Slob.

Mrs. C, being a universal NPCs, requires her own suppression.

I used insimenator. But I tried sim manipulator now and the day stuck!
Thanks for the tips guys!

Another question, why does the anti firstborn syndrome randomizer from batbox need to exit to neighborhood?

This doesn't have anything to do with townie regen. Townie regen only happens when you have made townies playable or killed them, and the game generates more to take their places. The ones that are generated when you start a new hood or attach a subhood are always based on what is in whatever templates you have installed for Pleasantview or whatever subhood it is.

The batbox randomizer creates a bunch of random sims. It exits without saving because otherwise your hood would have a bunch of random sims that you don't want in it.

If you have the UC, you don't need to do this anymore, you just need to use RPC.