In the US at least, I would suggest that you do mention hemp if serving to guests, especially any guests not well known to you.

Products containing hemp in many forms, like simple things such as poppy seeds on the rolls, can cause positives in drug testing. In some occupations random testing is very common, and in a few trades scheduled frequent tests are a requirement of employment. A person who innocently shows a positive result loses employment. Even if the result is "explained" and penalties waived, it may mean loss of a few months income.

Of course that doesn't apply to musicians ...(?)

John