You may laugh and say “I know how to be useless”, but to truly appreciate the value of uselessness, I recommend this: How to be useless | Psyche Guides.
It talks about the ideas of the great Chinese philosopher, Zhuang Zhou and his work, the Zhuangzi. (You may know him as Chuang Tzu from the great book by Thomas Merton on him.) If you have to do something useful this Sunday, I recommend you read that. Then go make yourself useless. 🙂