The NPCs Niuya and Helias are there for that. I keep the informations from the official P&C website in spoilers to avoid unwanted walls of text.
Niuya
Helias
Last but not least...if all else fails use cheats to stop them. X3
Replying to this because most recent, but yea noted on the "should have read earlier stuff". In my defense, I was really trying to get Harvest and she doesn't even have animations when you go to her room at night and the "wiki" is very incomplete so hard to look into stuff sometimes.
That said, even if you did want to go this method as an alternative, aren't you unable to pick who else travels and you might get ones that are like, seeking war? I know cheats are always an option, but yea it would be nice if you could tell your children to stop fighting while mom's away.
*messed with my save a bit to power level, apparently the cardinal bell isn't considered a dowry and you don't get it if you let Harvest elope with you so Scarecrow can take over (she's much creepier outside of her 'room'), so you still have to fight Pumpking to get it. That said, even after I used the bell on Harvest, I still didn't see animations and trying to remove clothes and look at stats afterwards crashed the game so... feel like I should just wait for a few patches or so.
*edit 2: Oh, looks like 16.7 just came out and adds missing harvest pictures, maybe complete'ish?