First of all I want to say that the mods you made for Huniepop 2 are really nice! But I am having this issue where HP1 Kyu and Venus don't show up as dates, despite having romanced every single character other than those two.
I have installed the latest versions of the following mods: Base, Base Tweaks, Expanded Wardrobe, Repeat Threesome and Ultimate. I also reckon that HP1 is installed in the right directory since I don't have any issues with the rest of the HP1 girls.
As for Momo, I tried discarding the goldfish plush at the park during every single time slot, but she doesn't appear when I use the finder to leave.
I was having trouble getting Celeste too because I was going to the beach at night with the quest item in my inventory and trying to leave. But doing the same thing during the evening seemed to do the trick.
As I mentioned in the beginning thanks for making these awesome mods!