What to do when you gone over your daily calories?

I just want to give some tips here, feel free to share yours as well to help each other stay on track and not discouraged through the process of weight loss journey.
Ok, let's get right to it.

If you only track calories, not macros (crab, protein, fat) then it's actually easy, your weekly calories is just as important as your daily, so let's say you're on a 2000 calories per day diet, and it's Friday you've been good for the last 4 days, you happen to go over by 500 calories today, simply reduce your next 2 days by 250 each, so your weekly still remain the same, or you can reduce next 4 days by 120, the goal is not to go into a punish mood where you take away 500 the very next day, because that will affect your metabolism more than if you just make small adjustments, and the whole point of been consistent is to build up your metabolism, not to make your body guess how it should burn off the energy/calories you put in each day.

Now I don't recommend to do calories track only diet, it works but not the most effective way, better way is to track macros within the calories counts, and when it comes to macros, you will have a good idea of how much carb, protein and fat you're eating each day, so if you went over on carb, you can borrow macros from protein/fat which 1 carb = 4 cal, 1 protein = 4 cal, so it's easy to replace protein with carb or vice versa, however, 1g fat = 9cal, so i'd go with a 2 to 1 rations if you went over on fat, that way your daily goal calories is still the same, and next day get back on track.
You can also consider increase your daily activity if you know you going to a party/event when there's food you want to eat but still want to be responsible to your own diet, by walking more, do 1 or 2 extra cardio sessions in the gym, nothing crazy just increase your activity a bit higher than normal, that's more of a mental thing than anything else thou, and try to control it not just use that as an excuse to over eat.

At the end of the day, don't let it bother you, it's normal when life happens we go over our calories counts, just use those method above and get back on track as soon as possible, remember you're in this for the long run not just 90 days.