Naked Raygun, Alkaline Trio and Screeching Weasel will headline concerts at the Metro (3730 N. Clark St.) as aftershows for this year’s 20th anniversary Riot Fest. The Alkaline Trio set is already sold out; the other two concerts are on sale now:

Screeching Weasel with The Effigies on Sept. 19 at 10 p.m. (doors open; ages 18+); www.etix.com

Alkaline Trio with Militarie Gun on Sept. 20 at 10 p.m. (doors open; ages 18+).

Naked Raygun with Marky Ramone and Buzzcocks on Sept. 21 at 10 p.m. (doors open; ages 18+); www.etix.com

According to an announcement Thursday from Riot Fest co-founder “Riot Mike” Petryshyn, Metro was chosen as the venue because of his longtime connection with club owner Joe Shanahan. Riot Fest was established in 2005 first as a multi-venue festival, including at M

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