in the yard; now that / at the point of마당에 literally means “in the yard.” In the pattern -(으)ㄴ/는 마당에, it means “now that,” “given that,” or “at the point of” doing something, often referring to an especially relevant or decisive situation.
KO: 비가 오는 마당에 밖에서 먹을 필요는 없어요.
EN: Now that it's raining, there's no need to eat outside.