Organisers of Knottingley and Ferrybridge Carnival - first held 87 years ago - fear the event could be scrapped unless more volunteers come forward.
Philip Butterfield, carnival vice-chairman, said the organising committee, which only has eight members, could be wound up at a meeting next month.
Mr Butterfield said: “I simply can’t constitute a committee to organise the festival for 2015.
“We just don’t have enough people to do it adequately. “The committee just get smaller and smaller every year.”
This year’s event saw hundreds of people line the streets to catch a glimpse of the procession as it passed through Ferrybridge and Knottingley.
There was then a family fun day at Knottingley Sports Centre.
Mr Butterfield added: “The carnival is the biggest community event in Knottingley. It’s been part of the community for more than 80 years.
“I would say it’s the one event that brings the whole community of Knottingley and Ferrybridge together.
“The festival is also one of very few to still have a mobile procession and hundreds of people line the streets to catch a glimpse of that.
“The key now is to get some of those people to volunteer their time to help organise the event.”
The carnival committee’s annual general meeting will take place at Knottingley Club, Hill Top, on Thursday, November 20.
Mr Butterfield said volunteers didn’t need to give up time on the day but could help with the organising of the event.
He added: “It is probably only a few hours once a month and then a little bit more nearer the time.”
If you would like to volunteer contact Mr Butterfield on 07723 3817480 or email email@example.com