We make sure that briefings are available. For example, on visits by His Excellency the Governor General to various parts of the world—his trips to Asia most recently, to Brazil and the Caribbean—we make sure that he is aware of any possible local sensitivities. But since he's a very well-travelled gentleman, there's not much you need to instruct him on.
But yes, we do, and not just for the principals on such a delegation, but because there are other members of the official delegation or the accompanying delegation, we do provide that kind of advice.
We also provide advice, when requested by those who contact us—say from a municipal or a provincial level of government—asking for particular advice. When we don't know, we find out, in consultation with others who would have more up-to-date or more detailed information.