The organisers of the Carmarthen Mayor's Fun Run races are appealing for competitors to get into the London Marathon spirit.
"We want this year's event to be fun, fun, fun," said race publicity officer Robert Lloyd.
"With that in mind, we are encouraging as many people as possible to wear fancy dress.
"A quick look at the TV pictures of the London marathon was enough to show how much fun people can have while raising valuable cash for charity.
"We want this year's event to be as colourful as possible. This is an Olympics year and we want to make the Carmarthen Mayor's Fun Run races as memorable as possible.
"Businesses are also being encouraged to add a splash of colour to this year's race by wearing corporate colours."
Runners of all ages, shapes and sizes are being encouraged to take part in the races next month.
The event, which has been held in the town over the past 30 years, will take place on Bank Holiday Monday, May 7.
"This is the 31st running of the races and we are hoping for a bumper turnout," said race organiser Noelwyn Daniel.
"We are asking local sporting teams, organisations, pubs and clubs to consider entering teams.
"There is a special 'relay' entry which allows the fun runners to complete one lap each of the three-lap main course route."
Mr Daniel added: "The beauty of the Carmarthen Mayor's Fun Run races is that they take place in the heart of the town centre, affording great opportunities for spectators to cheer on the runners."
Organisers are also working closely with the Sports Council for Wales to help promote a wheelchair athlete event.
The event has raised thousands of pounds for charity over the years with many local groups and organisations benefiting.
Schools are being contacted and visited by race organisers to encourage the pupils to sign up for the event.
There is the main 5k fun run and a series of junior races.
The junior races cater for school years two to 10.
The senior fun run has categories for males and females aged under 40 and 35, and veterans groups for older age groups.
Everyone who completes the course gets a medal.
Timetable -
10:00 Primary School Girls Years 1& 2
10:15 Primary School Boys Years 1 & 2
10:30 Primary School Girls Years 3 & 4
10:40 Primary School Boys Years 3 & 4
10:50 Primary School Girls Years 5 & 6
11:00 Primary School Boys Years 5 & 6
11:10 Secondary School Girls Years 7 & 8
11:20 Secondary School Boys Years 7 & 8
11:30 Secondary School Girls & Boys Years 9,10 & 11
11:40 MINI FUN RUN 6 years & Under (may be accompanied by an adult)
11:50 Wheelchair Athletes & Hand cyclists
12:00 Presentation of Trophies to all 1st, 2nd & 3rd in all categories. Medals to all who complete the course.
12:15 5km FUN RUN
Race website -
http://www.rasusymaer.org.uk/