Is 1020 calories a day good enough? (please don't judge me)?

I'm 23. 5'11 & weigh in at 284. I know i'm fat but i'm trying my hardest to lose it. I just want to change my life around and make me being healthy my main priority. I'm going to a wedding in August and will like to be 200 pounds before I go. I'm currently on a workout program called INSANITY. The workouts last about 45 mins a day. So i'm burning from 500 cals-700. I only want 3 big meals a day.. but very very low in calories. Like 300 calories for each meal is fine as long as their big on low calorie foods (vegetables, lean chicken, protein shakes that can replace a meal, etc.) & then 2 small snacks of like 60 cals. each. So That's 1020 calories a day. When i'm done losing the weight I'd like to be more active and will add more activities to my lifestyle and will make it 1800 calories a day instead of 1020. But right now I just want to look good for that wedding, yet remain healthy and not yoyo diet. I want to be FIT for a long time.