The federal government puts up $6-7 million for Independence Day celebrations, which mostly amount to musical performances and fireworks. DC also also spends a few million from its Emergency Planning and Security Fund. With NYC dominating the “national” NYE celebration, you won’t see the feds putting up millions for a DC-based celebration. If, somehow, a private org wanted to put something together on the Mall, they’d have to work with NPS, and that permitting process is quite onerous.