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Longman Dictionary of Contemporary English
fun run
noun
EXAMPLES FROM CORPUS
▪ A fund-raising fun run is being held on Sunday.
▪ A two-and-a-half fun run will take place at 10.30am.
▪ Any child below the age of ten taking part in the fun run must be accompanied by an adult.
▪ Monday, June 7 is the official entry closing date ... including the fun run.
▪ Registration is $ 18 for the 10k race, $ 10 for the fun run.
Wiktionary
fun run

n. A sporting event where people run a certain distance for charity rather than for competition.

WordNet
fun run

n. a footrace run for fun (often including runners who are sponsored for a charity) [syn: funrun]

Wikipedia
Fun Run

"Fun Run" is the first and second episode of the fourth season of the American comedy television series The Office, and the show's fifty-fourth and fifty-fifth episode overall. Written and directed by executive producer and showrunner Greg Daniels, the episode first aired on NBC in the United States on September 27, 2007.

In the episode, Michael Scott believes the office is cursed after he accidentally hits Meredith Palmer with his car. After being taken to the hospital, Meredith is found to have rabies. In an attempt to make amends with Meredith, Michael sponsors a fun run for rabies. Meanwhile, it is revealed that Jim Halpert and Pam Beesly are dating, while Angela Martin is mad at Dwight Schrute for killing her cat Sprinkles.

The episode received mixed reviews from the varying critics, while most praised the episode for Jim and Pam's relationship. However, critics had differing opinions when it came to how Michael behaved throughout the episode.

Usage examples of "fun run".

When we used to train together in Pakistan she would never give up, even on a silly fun run.