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Some things that come to mind:

• cloth napkins
• metal/glass/stoneware plates & silverware (if food is offered)
• recycle bottles/cans
• use wood or metal stirrers (recycle or clean)
• only glass/metal cups (clean or recycle (when the glass inevitably breaks))
• keep drinks off the dance floor
• minimal (if any) food options – must be portable, and relatively "mess-free"