Musical Chairs
A favorite from child's birthday parties, this party game can be catered to fit cocktail party-goers as well. To play, line up chairs, one less than the amount of people playing the game. Play music while guests walk around the chairs. When the music stops, everyone should scramble to find a seat. When the last person standing is without a chair, he must take a shot or a sip of his beverage. The game continues until only one chair is left.
Adult-Friendly Tag
You might have played tag as a kid, chasing friends around to make them "it." In an adult-friendly version fit for cocktail parties, instead of running, adults will take turns passing a note or object to one another. This item could be a cork from a wine bottle or a funny button. "It" must be discrete while sneaking the object onto another person. "It" continues to tag party-goers until the last person has been "it."
Bocce Ball
This classic Italian game is simple to play. One person rolls a ball on the ground to act as the goal. Teams then take turns getting their colored ball closest to the goal ball without rolling past. Because this game can be played one-handed, it is a favorite at cocktail parties for those who are weary of the idea of putting their drink down.
Croquet
This outdoor lawn game is just right for summer events. In this game, players work as a team to hit their colored balls with a mallet through a wicket, while thwarting the other player's efforts. Like bocce ball, this is another game that can be played one-handed to keep the party going at these outdoor events.
Horseshoes
Horseshoes is a casual party game that has long been a favorite of outdoor events. To play, individuals or teams take turns tossing metal or plastic horseshoes around a stake from several feet away. Variations of this game could include tossing rings around wine bottles.