No probs entering the London half-marathon (as I did in 2005). And you know why? I tell you why.
As soon as I'd paid the registration fee, and only then, did I realise where and when the venue was.
Date was a cold freezing, windy, dark February. The venue was an unsheltered, concrete, tarmac wilderness otherwise known as Silverstone.
Course merely consisted of running round the track a few times.
Managed it in 2hrs 5min but it was a drab day.