the logo could be about the t, or tk. also the whole word written in a cool font will look great.
It sounds like a 10km race as well which is nice. Coin might be good for charity donation when someone is running a 10km, half marathon or marathon and +. I still think inflation is a bit high, I would have liked seeing 9990 normal blocks and 10 superblocks, keeping it in a 10k block enveloppe, or 9900 nb and 100 sb.
That's my tuppence.