Ask bartenders not to serve doubles. Many people count their drinks so serving doubles will result in your guests drinking twice as much as planned. For mixed drinks and punches use only non-carbonated mixers, such as fruit juice or Koolaid to slow alcohol absorption. Make sure your facility is large enough to accommodate all guests, has ample sitting room, and has a comfortable temperature at all times. Limit access to the bartenders.
Fewer servers encourages longer spacing between drinks and easier monitoring of repeat requests.
Stop serving alcohol prior to the end of the party.