How do you deal with family parties/trips?

I can hold my calorie deficit when I am alone or with my wife (at least 6/7 days a week). I am losing weight slowly but continuosly.

But when we receive the family or go on a trip I don't count calories and enter in a "holiday mode", eating a lot more than the usual. I can gain 2 to 3kg on a weekend, which takes weeks to lose.

How do you deal with this? Should I bring my scale to the family trips? Should I avoid them? I'm really lost and disappointed.

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