Wow. I truly hope that you outrank his boss. My husband pouts when I can't go to events with him- at any weight. I would suggest what others have, ASK him! Talk to him.
But, that being said, yes, you can certainly lose the weight by March. Start now on a really low carb meal plan. I wasn't losing weight (i'm a 51 yr old female) on a low calorie plan. As soon as i went low carb like less than 10 a day, i lost 30+ pounds in 3 months. If it weren't for the surgery, I doubt i would have kept if off. However, I'm 5 weeks post-op and my body is in a major stall w no weight loss or inches lost. I've lost about 6 more pounds since pre-surgery. It HAS made a diff in how I look, feel, and present myself. And I know its not coming back. So my point is, if this really bothers you, start w a serious low carb and see how your body reacts. Mine loved it. You should be able to lose weight by march, but do it for yourself. Not him or his ignorant boss.