But festival organizers say he will not be replaced if he bails because there's no time to find a back-up.
The Atlanta rapper was arrested Sept. 1 in Los Angeles for ecstasy possession, among other charges. He's due to appear soon before an Atlanta judge who'll decide if he violated his parole.
In light of his legal woes, he's canceled three shows already - Penn State, Jackson State University, and West Virginia University, which was scheduled a day after Virgin FreeFest.
Seth Hurwitz, chairman of promoter I.M.P., says he's waiting to hear "official word" from the label about the scheduled appearance. But as of now, T.I.'s still on the bill.
"I don't know that we can plan until Thursday," he said.
If the Atlanta judge revokes the rapper's parole, and he cancels the festival appearance, the show will go on anyway.
"There's certainly enough entertainment going on," Hurwitz said. He's considered replacement acts, but hasn't found the right one.
"We're not going to find another act just like that," he said.
One possibility would be to extend other bands' set times, spokeswoman Audrey Fix Schaefer added. Set times haven't been locked in because organizers have yet to formalize a schedule of the day's events, five days before the festival.
Virgin Mobile FreeFest is Saturday 25 at Merriweather Post Pavilion. Follow up-to-date coverage at our FreeFest page and Midnight Sun.