Organisers have refused to give ticket-holders a refund, prompting fury from Jennifer Hudson's devotees.
Beverley Relfe tells the Ottawa Citizen, "I wanted to see Jennifer Hudson. I'm not interested in the rest of it because it's all people I don't know... There's going to be a lot of people (fans) who don't know she's not coming."
Bluesfest executive director Mark Monahan explains, "She unfortunately had a movie offer and couldn't make it... It's unfortunate, but we have like 250 acts, some of them do cancel for whatever reason."
Rockers My Morning Jacket are due to play in Jennifer Hudson's place.