Two years ago, Summerfest didn't announce a headlining act for its final day; it announced an entire day of headliners with the Outlaw Music Festival, featuring Sheryl Crow, Jason Isbell, Nathaniel Rateliff and a pair of icons – Willie Nelson and Bob Dylan – at the center.

It was a special and unique full-day festival experience, one so good that Big Gig couldn't help but bring it back this year as a mostly new Outlaw lineup – once again headlined by Nelson and his family – will take the Summerfest main stage on Thursday, June 27.

Joining Willie Nelson and company for the micro-festival this time will be Phil Lesh and friends, Alison Krauss, Dawes, The Avett Brothers, Counting Crows and Trapper Schoepp, totaling 10 hours of entertainment at the American Family Insurance Amphitheater starting at 1 p.m. (Doors open at noon.)

Tickets for this special festival within a festival will go on sale starting on Friday, March 8 at 10 a.m. at Ticketmaster and Summerfest's website. Tickets can also be bought in person at the Summerfest box office, Ticketmaster ticket centers and select Walmart stores, as well as by phone at (800) 745-3000 for a live Ticketmaster Agent or (866) 448-7849 for the "Ticketmaster Express" automated phone line.

For more Summerfest and summer festival announcements, stay tuned to OnMilwaukee. In the meantime, the Big Gig's lineup is starting to officially fill up with only four slots remaining. Here's what you've currently got to look forward to this summer (other than temperatures higher than 20 degrees). 

June 26: Thomas Rhett
June 27: The Outlaw Music Festival
June 28: Jason Aldean
June 29: Bon Iver
June 30: Zac Brown Band
July 2: TBA
July 3: TBA
July 4: Ozzy Osbourne
July 5: The Killers/Death Cab for Cutie
July 6: TBA
July 7: TBA