Jah Prayzah, Macheso headline OK Grand Challenge concert Staff Writer 2 years ago Jah Prayzah EVERGREEN musicians Jah Prayzah and Alick Macheso will headline this year’s edition of OK Grand Challenge Jackpot Promotion concert slated for June... To access this post, you must purchase a subscription. Please click the button below to visit our subscriptions page to select a package. Subscriptions