Going away for the weekend--Advice on not losing control?

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I'm going away for the weekend with a friend who eats differently than me (doesn't count calories or anything), and every time we're together I seem to lose all my will power. I'll crave candy, chocolate, fries--everything I don't even consider eating usually.

Does anyone have this problem when they hang out with certain people? Is there anything I can do to keep my resolve going?

I'm on the Wendie plan, and my highest points day is usually Wednesday. Would it screw things up if I moved that day temporarily to the weekend?