Light up Cardiff is a 5k and 10k run right in the heart of Cardiff bay.
The run is unique as it takes place AT NIGHT, where runners don flashing armbands and colour the bay in red as they run in their hundreds.
It is a small scale fun event starting at the Norwegian Church in Cardiff Bay.
Get your trainers on, get off the sofa, and join the runners, instead of sitting on the sofa on a Wednesday evening!
To buy tickets or find out more head over to EventBrite.