This is the 390th most frequent Korean word.
계획을
"계획을" means "a plan" or "plans" (objective case).
In this sentence, '계획을' refers to the act of making a plan for a recreational activity with friends during the weekend.
저는 이번 주말에 친구들과 함께 놀 계획을 세웠습니다.
I have made plans to hang out with friends this weekend.
Here, '계획을' implies the creation of specific and structured plans for a professional initiative.
그는 새로운 사업을 시작하기 위해 세부 계획을 수립하고 있습니다.
He is formulating detailed plans to start a new business.
In this usage, '계획을' denotes discussing the arrangements for an international travel proposal.