I wonder what the main national holiday is in Nige

I wonder what the main national holiday is in Nigeria? I got a phone call the morning of July 4, from a cell phone exchange, but they had spoofed the Caller ID to claim to be from Medicare. Boy, our government employees sure are diligent, calling on a national holiday from their cell phones. lol

Reported them to the FTC. Don't know if anyone actually ever does something to try to close these scams down, but....