The Scottish brewer said it was shutting everything to "spend the day with our people".
"As a company, we care as much about our people as we do about our beer, so we are having one almighty get together as a team. Our Ellon brewhouse will power down and cease production. Every single UK BrewDog bar will close for the day. Hundreds of our people will down tools and gather together on Blackout Day to continue to make our company the best company to work for," the company said.
"To put that into perspective, the only time our brewery usually stops are on Christmas and New Year's days. Closing your entire business for one day to focus on your people and assembling everyone from over 30 different locations at once is pretty revolutionary, we think."
BrewDog became a living wage employer in 2014. Speaking at a recent Publican's Morning Advertiser event, BrewDog bars managing director David McDowall said the policy has led to increased staff retention, reduced training costs and boosted like-for-like sales.