Willie Nelson added to birthday tribute, along with Margo Price and Nathaniel Rateliff

UPDATE: Willie Nelson also will take part in the May 1 celebration of his 89th birthday at his Luck TX ranch. Also added to the lineup are Margo Price and Nathaniel Rateliff. Tickets are on sale now at luckpresents.com. General admission is $35; two levels of VIP are available for $75 and $150. Parking at the ranch is $40; round-trip shuttle from Arlyn Studios is $50. Gates open at 5:30 p.m.; music begins at 7 p.m.

EARLIER: Willie Nelson turns 89 on April 29, but the celebration will last for days. In addition to previously announced concerts April 29-30 at the University of Texas' new Moody Center with George Strait, there's now a May 1 event at Willie's Luck TX ranch just west of Austin that will feature host Bruce Robison plus guests including Robert Earl Keen and Ray Wylie Hubbard paying tribute to the Texas legend.

Joining Robison, Keen and Hubbard on the bill is Vincent Neil Emerson, with more additions to the lineup expected. There's no official word on whether Nelson himself will appear or perform, but he currently has no other concert commitments on May 1.

More:George Strait, Willie Nelson to play Moody Center's opening bash

Nelson previously announced three upcoming performances at Luck, on March 20, March 26 and April 2. Those are in addition to his March 17 Luck Reunion mini-festival, which also will include performances by dozens of artists in town next week for South by Southwest.

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More:On the ranch again? Willie Nelson adds three shows at his Luck TX property near Austin

Nelson's new album, "A Beautiful Time," comes out April 29 on Sony Legacy. It features a mix of new original material plus covers including the Beatles' "With a Little Help From My Friends" and Leonard Cohen's "Tower of Song."