They were promised foam waterfalls, rain tunnels, even snow – but the runners who signed up for this weekend's "Color Buzz" event in Melbourne may have been sold a lie.

Concerns first emerged after those who paid up to $54 dollars to attend the fun run failed to receive any further information, or their promised t-shirts and goodie bags ahead of Saturday's event.

The Color Buzz website. Credit:colorbuzz.com

Emails to Color Buzz's organisers have not been returned, stoking fears that the event is a scam.

Some ticket holders had received emails saying the fun run would be held at Flemington Racecourse, as are the legitimate but similarly-named "Colour Run" events.