A week away from home....worried!

I second the drinking advice above. Offer to be the DD, or have one drink. Make a commitment to log when you can. Remember that you know how to get on track when you get home, too. Patience!

suggest eating a couple of meals in, offer to grocery shop/cook meals ( then you get to control the ingredients) & make yourself exercise everyday even if it is poor weather. If your visiting family, hopefully they are supportive of you and will understand your wanting to stay on track

If you're going to be there a full week, I'd stop at the grocery store the first day and purchase a few staples for breakfasts and lunches. If you can keep one or two meals per day routine, you'll have a lot more flexibility with those dinners out and much less anxiety, too.

Keep in mind that you can eat up to maintenance and not gain!

I offered to cook every night when I was at my parent's place. The offer was turned down so I just made salads and vegetables to accompany the mains we were having and not eating so much of them. I had complete control over my breakfast, lunch and snack options as I went to the supermarket upon arrival and bought the things I needed.
Knowing I don't get as snacky when I'm not at work, it was easy for me to shift some cals into dinner so I didn't look like a picky cow not eating much. My mum also lives on some of the biggest hills in the city and in a block of appartments with a millionty stairs so there was my exercise!

The thing I found the hardest was being treated like a stange alien invalid. They got upset when I turned down lifts to places and just wanted to walk instead. Also shopping was a nightmare as everything I picked up was questioned and as they were shopping at the same time I got asked if I was 'allowed' to eat every item they picked up.
At the end of the day, those things cannot sway the action of what I put in my mouth. I forewarned them I was eating healthy and would continue there. I had to realise their concept of 'eating healthy' was 'dieting' and everything I should have put in my mouth should have been either rabbit food or crazily processed lite and diet foods.

In saying that, it did give me the opportunity to start changing their perception of healthy eating. I was still eating take away shop salads and chickens. I still ate deep fried spring rolls (I don't care what eating plan I'm on, I'll ALWAYS make allowances for my mum's spring rolls). I ate ice cream. I ate full fat yogurt. The meals I was eating had them drooling! Yogurt with berries and rye toast..... poached eggs and baby spinach... salads chock full of tasty things.

Just plan ahead. Ask where you'll be going and try and save the cals for it. If you go over, exercise a little more the next day to make up for it. Don't think you can't enjoy because you are on this plan.
I wouldn't be drinking alcohol though, but that's because I don't really like to.

You have all the information you need, and the willpower. The same things that are driving you in your home environment will be the same things that motivate you when you are on your trip. You can do this. You also have to remember to enjoy your trip though. By the sounds of it this trip is not something you are able to do all the time to please ENJOY yourself and don't let micromanaging overwhelm you.
YOU GOT THIS!