Newport also has a tendency to have a few "we didn't particularly bother to tell anyone unless you happened to be in the right place at the right time" charity events. Some of which are runs, while others are 'designed for walks, but you can run if you want'.
For example - Campus-Campus, RGH 10k(ish), 3 peaks challenge, Newport 'pink fizz' half marathon
They are just really badly advertised.
I'm going to look out for the 3 peaks next year. I saw it advertised on a blackboard outside a pub, which was race HQ.......and only remembered about it on the day when I saw a group of about 30 mixed walkers/runners heading off. Mynydd Islwyn, Mynydd Machen and Twmbarlwm - sounds fun.