Is it too late to send an update?

Hi I heard that its good to send updates of accomplishments since the application to colleges. I was deffered from two schools, and have other regular applications. Is it pretty much too late at this point to send the update? It would just be about my placing at national debate tournaments.
Thanks!

The only issue you need to know the answer to is whether doing an update would harm your chances of admission and the answer is no. The worst that can happen is that colleges ignore it. You thus should send it. It may not help at all but there could be some chance it might, e.g., it might be too late for some who will be issuing decisons shortly, but maybe not.