This year, Darkness Day will encompass not just one day, but two.

According to a post on Surly Brewing Co.’s website, it will again be releasing Darkness Russian imperial stout on Darkness Day 2019, which this year will fall on Sept. 27 and Sept. 28.

The Minneapolis, Minn.-based brewery’s Russian imperial stout is brewed with pale ale, golden promise, crystal, dark crystal, oats, black, chocolate, and roast malts, as well as Amarillo, Columbus, and Simcoe hops. In addition, Surly has historically released a barrel-aged version of the Russian imperial stout on a later date than the regular version.

The series started in 2007 and has featured a different monster on the bottle every year since it was first released, although this year’s monster has not been announced yet. Past years’ label art have included depictions of “a screeching bat nightmare,” a mummy, the Devil, a vampire, a werewolf and the Grim Reaper, among others.

According to Surly, this year’s Darkness Day 2019 will be held on both Sept. 27 and Sept. 28 at the Somerset Amphitheater in Somerset, Wis., with tickets going on sale in June. In addition, a video on the website indicates there will be “new Darkness variants” as well as “vintage and rare beer” for sale at the event.

An email sent to the brewery for additional information was not immediately returned.