This year Llanfair Caereinion's theme is "back to the 1980’s', with carnival queens and attendants being asked to come forward.
Nikki Peate, chair of the carnival said: “It is going to be really exciting this year as we go back to the decade of standout fashion, classic TV programmes, amazing films and some great pop music.
"It will be fascinating to see what ideas people use to decorate their floats. It is always difficult to judge as the standard is always fantastic, but I think it will be harder this year."
The procession will leave Llanfair and Welshpool Light Railway station at 12.30pm and will make its way through the streets of Llanfair Caereinion alongside fancy dress competitors.
Both floats and fancy dress competitors will be judged and prizes awarded. For fancy dress, the categories include, under 4's, under 7's, under 11s, over 12s, adult and best dressed pram competitors and they will be judged at Llanfair Institute at 11.45pm.
This year the carnival field will welcome Tractor Ted and Soccerholics 'R' us, Balloon Sculpture and Magic, and in the Main Ring, the Mega Illusion Show, Cambrian Band, Powys Dance, Caereinion Kangaroos and Cheerleaders.
Refreshments will be provided by Kevins’s Burger Van, Banwy Café, and a special Gin and Prosecco Bar as well as others, plus some other stalls
Entry is £2.50 for adults and £1.50 for children. Under four years old go free.