C25k on treadmill then straight to a race

Has anyone here run the entire C25K program indoors and then gone straight into an outdoor 5K race?

I find it so much easier to jump on the treadmill. I need a lot more motivation to run outdoors.

I've dusted off my wife's treadmill and finished day 2 - that took all my motivation ha!

So I'm thinking of just committing to doing the c25k on the treadmill. But I'd like to cap things off with a 5k fun run. Not sure if that's unreasonable though.