Hundreds of bands will appear at the Fair Grounds during the 2016 New Orleans Jazz Fest. But an ever-growing number of concerts also will fill major venues around town after dark, including two shows announced this week for the same night.

On April 30, homegrown contemporary funk band Galactic and Florida-based backwoods blues/soul/rock jam band JJ Grey & Mofro will co-headline the Orpheum Theater downtown, with Moon Hooch opening. The show is presented by radio station WWOZ-FM. Tickets are $38 for the gallery, $48 for the balcony and $58 for orchestra standing room only, plus service charges. Tickets go on sale to the general public at 11 a.m. Friday, following a presale on Tuesday. They will be available at tickets.orpheumnola.com or via the Orpheum box office, (504) 274-4870.

Also on April 30, Dan Auerbach, of the Black Keys, will lead another of his bands, the Arcs, at the House of Blues. Tickets to that show range in price from $35 to $75 plus service charges, on sale Friday at 10 a.m. via Ticketmaster and at the HOB box office.

The Arcs released their debut album, “Yours, Dreamily,” in late 2015. The radio single “Outta My Mind” recalls latter-day Black Keys, but with a slightly more psychedelic slant.

The Arcs and Galactic/JJ Grey & Mofro shows join a slate of previously announced Jazz Fest season concerts, not all of which are necessarily aimed at festivalgoers.

The original four members of the Meters reunite at the Orpheum Theater on April 22, the opening day of the 2016 Jazz Fest.

Duran Duran headlines the Smoothie King Center on April 24, Jazz Fest’s first Sunday; the bill also includes Nile Rodgers & Chic.

And modern jazz saxophonist and Mardi Gras Indian Big Chief Donald Harrison Jr. is at the Orpheum on April 26, between Jazz Fest weekends.

More concerts for the 10-day span of the festival will likely be announced soon.