The word given here means certain or sure to happen. So while the fishing is uncertain, not 100% sure to happen, a good time with his friends is sure to happen:)

Can anyone help me with the question below? Thanks. What does ‘given’ mean in the following? … ‘Given’ is an interesting word in that it is commonly used in four different parts of speech: verb, adjective, preposition and noun! The preposition and noun meanings are similar. Given that he’ll have a good time with friends, he wasn’t concerned that it might rain. (Taking into account, preposition) The good time with his friends was a given. (Established fact, noun) The givens are that it is a right triangle, with an opposite side of length 1 and a hypotenuse of length 2.