It will take place Sept. 21 at the Hippodrome Casino, two days before she flies to New York.
She will be joined by guests who are still to be announced.
Erivo was most recently seen on the London stage in a revival of Jason Robert Brown's Songs for a New World at the St. James Theatre. Other roles in the West End include starring in I Can't Sing! (London Palladium) and the all-female Henry IV (Donmar Warehouse, directed by Phyllida Lloyd). Off-West End credits include LIFT (Soho Theatre), and regional credits include Sister Act: the Musical (on tour) and A Midsummer Night's Dream (Liverpool Everyman).
To book tickets visit http://www.hippodromecasino.com/whatson/cynthia-erviro-2/.