The formerly flashy rap star has earned back his freedom after more than a decade.
Rapper spent 17 months in an INS detention facility.
Grandmaster Flash, Roxanne Shante, Run-DMC's Jam Master Jay, more also in attendance.
Mr. Cheeks also performs to crowd that includes Busta Rhymes, Rockwilder.
Film, slated for March 30 release, will be darker, more realistic.