To prevent someone from getting seriously hurt or ill at your party:
Watch for emerging fights and drunken guests, especially as people consume more.
Offer soda, fruit juices, water, and coffee so that guests have alternatives to alcohol.
Discourage rapid drinking and drinking games.
Provide plenty of appetizers, snacks, and other food. NOTE: Food only changes the pace that alcohol enters your system—it has no effect on the pace that alcohol leaves your system. Coffee, cold showers, aspirin, etc. – will not sober you up; only time will do that.
Use cups that make no distinction between alcoholic and non-alcoholic beverages, so that people who aren’t drinking alcohol don’t feel self-conscious.
Request identification from anyone who appears 30 years of age or younger. Guests who cannot present a valid form of ID should not be given any alcohol.
Model appropriate behavior for your guests and be sure to communicate that becoming intoxicated is not the goal of the party.
Make sure anyone who's visibly intoxicated doesn't receive more alcohol and not left alone. Even if the guest isn't driving, an impaired guest can hurt injured or harm others.
Have a plan to deal with any guest who drinks too much. Before the party, ask someone reliable to help you keep things under control.
When necessary, provide alternate transportation for impaired guests. Either call a cab or the help of sober friends to take the impaired guest home. Call 911 if there are any concerns about someone’s safety when they are intoxicated.