Where the drink is the courtesy
Orange blossom infusion in Tunisia and Morocco. Mate passed round a group by one server. Sakurayu at Japanese engagements, served precisely because the word for tea carries an unwanted association at a marriage. Kashmiri kahwa. In each case refusing or mishandling the serving is more conspicuous than disliking the taste.
Learn the order, not just the recipe
Mate has a server, a fixed direction and a convention for signalling that you have finished. Moroccan mint tea is poured from height, three times, and the first glass is often returned to the pot. These are not flourishes; they are the form, and they are what a guest is actually participating in.
Practical hosting
For a group with mixed caffeine preferences, the roasted grains and rooibos are the safest defaults — forgiving, unfamiliar enough to be interesting, and caffeine-free. For something with a story, a named regional preparation served as its tradition serves it is worth more than an unusual plant served generically.
What not to do
Do not present a living practice as an exotic novelty, and do not mix the props of one region into the service of another. If you are serving something from a tradition that is not yours, saying where it comes from is the minimum and is also the most interesting part.