Serve a Pimm's Cup or a traditional gin and tonic, or another signature cocktail influenced by royal history, to guests as they arrive. If any of your guesrummy livets are new, go over the rules of rummy with them after they have settled in. Think about planning a small tournament with rewards for the winners, like a fine wine bottle or an exquisitely designed deck of cards. This competitive component makes the evening more exciting and promotes amicable player banter.