Pretend Drinking

Wondering if anyone has some good tricks for avoiding drinking in settings where it is usually inevitable.

My partner and I are traveling to another city to visit his family this week. This trip usually comes with a number of family parties and dinners with drinking as a central thing. We will only be at 8 weeks. We're planning on telling his parents but think it is a little early to tell all the aunts and cousins.

Anyone have any advice or tricks to make the week a little easier?