Party trash

Saturday morning 8:30, it is way too early to start a day. I get out of my room and I soon realize the havoc that went through some hours ago. We thought of that before hand and created two boxes to store recyclables and garbage. The consumption surpasses our expectations and so did the trash. What can we do as designers to reduce the waste in parties? Buy kegs? Everyone has different tastes in beer? And the liquor and plastic cups? If you have any idea please post a comment.