Premise: "A small child standing in the grass watching a band playing at an outdoor event."\nHypothesis: "The child was at home playing in the sandbox in the back yard."\nDo we know that the hypothesis entailed by the premise?
Let's be accurate as possible. Think before you answer.
no
In the grass is not at home.

Watching a band is not playing in the sandbox.

.

So, the answer is no