People, Seriously?
A daily/nightly event for months all over the country. At least a couple of instances recently where 4+/- Centers (identifier starts with a Z) were all ATC Zero in one night.
Your best resource for the Big Picture is here:
https://www.fly.faa.gov/adv/advAdvisoryForm.jsp
Leave the check-boxes as they are; you can change the date drop-down to go backwards for a rolling two weeks.
Click "Show Selected Advisories", the hyperlink next to the advisory number for "Operations Plan" displays The Big Picture. Normally the Operations Plan is updated every 2 hours.
Remember that all times displayed are UTC.