I tend to not go mad, I make sure I get LC treats in for special occasions.
My birthday was 10 days ago, my family know I won’t eat high carb stuff even on my birthday. I got a LC chocolate birthday cake from Deliciously Guilt Free, my daughter bought me some dark chocolate covered Brazils. I ate in a couple of restaurants on the day (on a spa break) both were very accommodating with removing carby things. For example I had a Caesar salad for lunch and they substituted the croutons for little cubes of Brie.
Xmas time I have most of the Xmas lunch, just one tiny roast potato, plenty of meat and veg and not too much gravy and I make a low carb Xmas pudding with cream.
Xmas tea time usually at our house, we have cold cuts, cheese, salad (crisps, bread and crackers for the carb eaters!) then a big sugary trifle for the non Ds, and I make myself a couple of individual lower carb ones.