Avenged Sevenfold will rock First Avenue with free pre-Metallica concert

Avenged Sevenfold at Target Center in 2014

Avenged Sevenfold at Target Center in 2014 Star Tribune

For those about to rock, your week just got busier.

That's because Avenged Sevenfold, who are set to open for Metallica at U.S. Bank Stadium on Saturday, just announced a free warm-up gig Thursday at First Avenue. The veteran Cali hard-rockers dished about the surprise concert Wednesday via 93X. 

“Anyone who wants to go just needs to line up, and they can get in free,” A7X leader M. Shadows told the radio station. 

But how did this happen?

"We got into Minneapolis a little bit early and decided we wanted to play a small gig to get the blood flowing again," Avenged Sevenfold writes on their website. "We called up the world famous 'First Avenue' and asked if we could play a free show tomorrow night, Aug 18, and they said yes! So, there you have it!"

So there you have it! 

There's a practical purpose behind the relatively intimate show. Drummer Brooks Wackerman (Bad Religion, Mass Mental) joined Avenged Sevenfold last fall, so he could use some reps behind the kit before playing to 55,000 headbangers at the new $1.1 billion Vikings home. “It seems insane to just throw him into that,” Shadows said. Instead, Wackerman will be thrown into 1,500 fans at First Ave.

Speaking of insanity, tickets to the Metallica show, which follows Luke Bryan's christening of U.S. Bank Stadium as a concert space Friday, are going for $9,900 on the secondary market