Your profile says that you’ve been eating a ketogenic diet for only a few weeks. That means you are not likely to be fully fat adapted.
So if you were to take the “screw it” approach, you’d be delaying your fat adaptation, but not ruining things irretrievably. The problem with this approach is simply the question of getting back into this way of eating afterward. Some people find sugar and carbohydrate addictive, and such people are likely to find it hard to stop eating carbs once they’ve started up again. If you think you might fall into this category, that would be an argument against the “screw it” approach. You know yourself best.
There are also other strategies you can take. You can look for the most keto-friendly of the food that’s available and stick to eating that (meat, cheese, high-fibre vegetables, bacon and eggs for breakfast instead of cereal). You can also bring cheese, pepperoni, and pork rinds to snack on—and whether you’d want to bring enough to share or just have a secret stash is something to think about. (Probably depends on how many people will be there, I would think.)
Part of this will depend on how much control you will have over your meals. If you are staying in a motel and eating at restaurants, you can just order keto meals and have keto snacks in the room. If you are staying in your childhood home, and Mom will be hurt if you don’t eat her special carb-laden whatever, that’s a more-difficult challenge.
The reason you are eating a ketogenic diet might also be relevant here. If you are trying to reverse Type II diabetes, you can say that your doctor has advised you to stick to a special diet. Even people who are likely to sabotage a mere “diet” choice are likely to respect medical advice. (And you don’t need to mention that the doctor in question is Dr. Stephen Phinney or Dr. Eric Westman.) On the other hand, if your primary reason for eating ketogenically is to lose weight, you are still early enough in the process that your progress will not be greatly delayed if you stray off the diet for a couple of days.
One last possibility is that if you mention you are trying out this keto diet thing, you will find there are other people doing the same thing. It doesn’t always show, just looking at them!
So just try to think the various options through calmly and rationally, and don’t worry that we will judge you for whatever decision you make. It’s your life, and you are in charge.