If I were a man I would think about having a marriage proposal at Christmas. It could make the moment very special and it is also very surprising as normally the bride does not expect the proposal at the holy night. You can use some nice lights, candles or mistletoe to make your proposal extraordinary. As Christmas is already special by itself, you do not need to overorganise this.
It is maybe unbelievable, but the holiday season is very popular time to pop the question. I think it is understandable, as it is all about love and Christmas has a romantic feeling too. So gentlemen, let’s start the preparation!