One thing I think is key to being a good ally is to work mostly in the background, to avoid the spotlight unless necessary, and to yield or share it when possible. Speak less, listen more, trust what you hear and defer to the judgment of the underrepresented party.

There was a moment in college when I was participating in a Take Back the Night march, and I was leading the call-and-response chant "What do we want? Safety! When do we want it? Now!" It felt awkward and wrong. Once I stopped leading the chant and started participating vigorously in the response of the call-and-response, it felt right.