Final answer:
It is not possible to determine which event took place closest to the Washington speech mentioned in the question, as the specific speech is not specified in the provided information.
Step-by-step explanation:
The Washington speech referred to in the question is not clearly specified in the provided information. Without knowing the specific speech mentioned, it is not possible to determine which event took place closest to it. The information provided includes references to the March on Washington for Jobs and Freedom, speeches by George W. Bush, and a speech by Booker T. Washington. However, without additional context, it is not possible to determine the closest event.