The String Cheese Incident have added some special guests to the bill for their three-night, 20th Anniversary Celebration/New Year’s Eve run at the 1stBank Center in Broomfield, CO. The band has announced that Bootsy Collins and the Funk Unity Band will now play an opening set on December 28, while The Flaming Lips will hold down the opening slot on December 29. The Tiny Universe Horns with Karl Denson and Chris Littlefield will also be on hand on the 28th and 29th. In addition, the December 31 performance will feature special surprise guests from the band’s past.

The String Cheese Incident have also revealed that all ticket buyers will received a download code for a remastered mp3 of their very first cassette tape, which includes early recordings of 11 classic SCI songs.

Tickets to the shows are now on sale.