“Failing to greet or thank the host is a quick way to appear ungracious,” says Vivian Otabor, executive director of Etiquette Global Academy. “Always show appreciation for their efforts, and offer a compliment and smile to show gratitude for being invited.”
Even if you’re a plus-one or one of many guests, be sure to at least acknowledge the person who has put together the event. If a party is co-hosted, this goes for the other hosts as well.