If i remember... For monika is like go to the park in sunday afternoon and go to the right side. I think. That's all i remember of her. Then for olivia is i think on Sunday? Just give her ice cream everyday and maybe it'll happen. Again i don't remember much cause it's been months or a year since ive played this game. And i only got to see the Olivia scene part once and never got it again and i have no clue where she is, it's like she vanished lmao.