That is not a bad idea. If you want to manage budgets, which will certainly be very large, you will also want some kind of technical support. At least I know that I would not want to manage them alone.
I would like to highlight the importance of being inclusive when planning something like this. I have heard a number of mentions of the idea of an independent organization managing the 150th anniversary. But if this organization has a board of directors, why not have youth representatives sit on it? As was mentioned, these would be youth representatives with important voices, and not young people who would be there simply because they are young.