Entries for the annual Flemington Mud Run in CHB on November 19 are open, with discounted entry fees on offer for those who register online.
Flemington School Parents and Friends Group chairman Andy Barrett said the annual event raised money for the "best little school in CHB".
"Bring your friends and family, or do it by yourself. We guarantee a great day filled with fun, laughs and some delicious food."
This year's mud run would boast course options of 2.5km, 5km and 10km, he said.
"Children under 7 must be accompanied by an adult at all times on the run.
"Shoes must be worn, and we definitely recommend bringing clean clothes. Costumes are encouraged and appreciated, with spot prizes for the best."
Pre-registration prices are $10 for primary pupils, $15 for secondary students, $20 for adults and $50 for a family of up to six.
Entries will also be accepted on the day, but will be $5 extra for individual competitors and $10 extra for families.
"So why not organise a team, get some friends together and buy your tickets online now," Mr Barrett said.
• For event details and online entries, visit flemingtonmudrun.com