Solange deleted her Twitter account on Tuesday night after tweeting a message of support to Takiyah Thompson of North Carolina.
The two artists will "curate jams" for an exclusive event.
Teen fan Solange joined the band to play “Aqueous Transmission” on Wednesday night.
Jorja Smith has also been added to the festival, which takes place August 26 and 27.
Chappelle will celebrate his 30th anniversary of standup in August.
Missy Elliott hung out with Beyoncé, Solange, and Björk during her return to the stage.
Frank Ocean, A Tribe Called Quest and Erykah Badu performed at FYF Fest on July 22.
Listen to Sampha cover Solange's "Cranes In The Sky"
Solange took the best selfies with Gucci Mane, Keyshia Ka'oir, Cardi B, and Lil Kim at the 2017 BET Awards.
Solange will be replaced by Migos at the Boston Calling music festival this weekend.
Solange released a limited-edition book "An Ode To" to celebrate her performance at the Guggenheim Museum.