Socializing Myself into a Bad Food Day

I don't drink. I don't smoke. I take pharmaceuticals to combat hypercholesterolemia, to act as an antihypertensive, as well as to reduce the signs and symptoms of psoriasis. There! You've got my medical history.
My two main focuses throughout the waking hours of the day include watching my food intake and recording my money outlay. This is accomplished by maintaining a day journal for expenses and recording a food diary for daily nutrition. Most Americans I know don't do either. Measuring or weighing food seems abhorrent to the folks I know who are not concerned with their personal nutrition or caloric intake. (I get a good laugh when those who are mortified claim to be members of the science community... as if they had never seen a beaker or graduated cylinder in their vocation!).
I don't generally ask for affirmation of this activity. I also don't share it much because I am not interested in being the spokesperson for something I consider to be moderately virtuous and I also don't EVER want to be the victim of someone else's nay-saying or poo-pooing something that is part of my life or lifestyle.
The calorie counting is based on looking at a set number of calories one needs to live and thrive throughout the day. It's pretty light-weight math. Say one considers a 1,200 KCal diet per day. If that same one eats three meals per day, then each meal would average 400 KCals each. If one were to eat four meals per day, then each meal would average 300 KCals each. Of course, there are some who eat smaller amounts and spread it out throughout the day... In those instances, the same formula would apply:

TOTAL DAILY CALORIE ALLOWANCE ÷ NUMBER OF DAILY MEALS = CALORIE ALLOWANCE PER MEAL​

It has been useful and seems to work well for me. I have lost somewhere between 50 and 55 pounds over one and a half years. I'm in a period of maintenance now. Maybe I am not at the goal, but I just am not losing more right now. So I am looking at other things that might be assistive in the equation such as higher levels of physical activity within my means or a possible change in the actual food choices so that micro-nutrients could work more effectively in the weight loss process. Fortunately, I am not diagnosed with any other health issues other than those I had mentioned and those two can be treated with small, daily doses of medicines.
Yesterday I was invited to socialize with friends over meals. I went to the Farmers' Market and did some mild grazing (tasting the pink lady apples and the cara cara oranges).
Later I had lunch at a neighborhood café with a friend. The lightest item on the menu (except for Romaine lettuce salad) was a turkey sandwich. It was on a baguette and it pushed the calorie count up. Could I have split the sandwich in half and taken the other half home? Yes. That would have been sensible. But I didn't. Oh, and before I forget, I wanted to know what the soup du jour was and--when I was told that they had not made any soup on that jour--I opted to exchange the non-existent soup for a toasted bagel with cream cheese. (The bagel, sadly, was not toasted, but that is small fry and not something worthy of complaint).
The meal was 530 calories. That's a guess. And I guess on the low side. I feel helpless when I eat out since most restaurants and cafés opt not to offer the calorie count of their meals. I don't hold that against them.
That evening I went to a friend's home for ossobuco made in an electric slow cooker. I brought a baguette from the Farmers' Market and a bottle of red from Cost Plus/World Market (n.b. the boy don't drink). That meal of ossobuco, pasta, asparagus, and baguette was followed by fat-free vanilla ice cream, Cool Whip, and blueberries. In my estimation/guesstimation, it rang up as 1,380 calories. Assuming, arguendo, a daily intake of 1,200 calories, this one meal would add to the sum of the day with a 115% increase of caloric intake.
Why all the fuss? What's the big deal? No harm done, right?
What bothers me so is that the 'damage' is done during times when I am socializing with others. It is as if I were allowing myself to go off the deep end in order to enjoy the moment with my friends/acquaintances. And then I have to deal with the struggle of getting myself back on track, pulling myself of by my bootstraps, or some other trite, hackneyed cliché that falls on the ear with a dull, sickening thud.
SIGH. So, at the end of the horrific over-indulgence in a Thanksgiving-like food frenzy, I am left saying the words of Scarlet O'Hara, "Tomorrow IS another day!"