It has been three years since the event was held and organisers say they are looking forward to the post-lockdown celebrations.
A week of activities will lead up to the carnival on August 6.
Chairman Richard Bright said the carnival was celebrating its 150th year of being in existence.
"The procession theme is based on the Victorian Era - where it all began," he said.
Anyone who wants to get involved in the procession can just turn up on the day, no advance entry is required.
The procession will assemble around noon then parade through the town at 1pm. It will end at the castle grounds, where an afternoon of fun will get underway.
Mr Bright said: "The Clun Carnival and Show Committee are honoured to announce that this year’s show will be officially opened by the Lord Lieutenant of Shropshire, Anna Turner, the Queen’s representative in the county."
He said the interest in the show was huge, with 700 entries in the competitions marquee and a dog show.
During the week before the carnival there will be an arts and craft show in the Hightown Community Room.
Events include music and flowers in Clun Methodist Church, on August 2; Victorian entertainment at St George's Church and a quiz at The White Horse, on August 3; a walking treasure hunt, from Clun Fire Station, on August 4; and the Clun Canter, multi-terrain fun run, from the Square, on August 5.
The week will end with a praise concert at the showground bandstand on August 7 at 11am.
Mr Bright, thanked the committee, which has spent long weeks organising the events, and the hundred strong volunteers giving up their time for the carnival.