So having completed C25K last month (and carrying on with three runs a week) myself and my best friends wife who did it at the same time, ran Run or Dye Oxfordshire yesterday - a 5K run with loads of corn based colour dye. It was a great atmosphere and a nice event. We ran together and completed in around 30 minutes (its an untimed event). Overtaking lots of other runners made us realise how far we had come along since starting C25K in June.
We both had spectators and it was a nice fun pat on the back to ourselves for completing the program. Would recommend it.
Now we are choosing our next event to work towards (due to distance we train separately but keep supportive messages going between us). We are thinking of a 10K Monster race next year....but need to start looking at some upper body strength for that I think.