Tacking etiquette, for guests, adds to the mystique of sailing. As the captain and host, part of your job is to introduce your guests to the world of sailing. They already know it is a different world unto itself and has its own language and customs. You play tour guide by briefging them on some of these customs. You talk to them about saftey, sure, but also about what to expect and why, when boarding, docking or casting off, hoisting sails, maybe a little about right-of-way and channel navigation, and... most especially, what to expect when tacking.
Use the language, "Ready about?", "Coming about.", "Helm's a-lee.", "Hard a-lee!" They will eat it up. It's like visiting a foreign country.
Shift seats because you're the helmsman and you NEED to have the best view. It's in the regs. Explain it, they will get it. If they wanted to just socialize with friends and not be asked to accommodate the mode, a pool party would be better.
-Will (Dragonfly)