Some celebrations aren't complete without cocktails, so let your guests raise their glasses with something special: a drink created just for the party. A themed concoction adds interest to the occasion: Don't tell guests what's in the custom mixture; let them keep guessing your secret recipe. A party-specific beverage does something else, too, that nobody needs to know about: It lets you control your alcohol budget. When you offer a cocktail specifically for your celebratory occasion, you don't need to stock a full bar. You only need to buy the ingredients for your libation. And for even more portion and cost control, have the drink already set out for guests as they arrive and then dispense refills yourself.