If you can't advocate for yourself, how are you going to advocate for anybody else? A promotion process, if there is one, is an important time for you and the organization. Lots of people's time is being spent to figure out whether to elevate an individual towards a position of company leadership. In the long run, it's far, far more important than any individual project you might be working on (and if it isn't, show that you can get yourself out of the front lines, or you are destined to fail at management).