The show, starting at 8pm tomorrow on a hosted by MSN, will feature Morrison promoting the Qubo in an introductory video.
A separate promotional video of the new mini-MPV will also feature, along with a testimonial video by Qubo owners.
Morrison's never before released videos and exclusive performances will also be accessible on the site, plus free downloads will be offered to those registering their details.
Users will have the chance to win a Qubo for a year, as well as a test drive, signed James Morrison merchandise and tickets to his UK tour.
Fiat's campaign will also appear as a home page take-over on , and sites for the duration of the day on Thursday.
Elena Bernardelli, marketing director at Fiat UK, said: "The Fiat Qubo online event will feature in customers' own homes, but with all the benefits of a real event, including music performances, testimonials, and goody bags to be "taken home".
"This is an amazing opportunity for us and our dealers to showcase our dedication to break the barriers, and lead by using a digital platform to promote our fantastic products like never before."
The Qubo microsite will remain open until the end of March.