Tips and Tricks -
ALWAYS - make sure you have an escape route. Better to dissappear sober than be carried away drunk.
Walk around with a glass of coke or orange juice - iced and kept about 3/4 full - That way no one knows you're not drinking and and also don't ask to 'freshen your drink'
ALWAYS - get your own drink. If someone does get you one, don't chance it. Find a way to politely pour it out and get one yourself.
If you have an AA or sober friend and can swing it, bring them
Leave early - If everyone else is drinking, they won't notice anyway