It's an 'open' event which tends to be a bit more serious and requires entry in advance. 'Club' events tend to be a bit more casual, entry on line etc.
Hmmmm. Wondering how bad a twat who's main cycling is commuting, on a self built steel tourer, running a triple chainset and 28mm schwalbe marathons is going to fare. :)
You'll have lots of fun, and that's the whole point. If you've never done one before it's quite exciting / nervous making, feels like being part of something a bit official with timekeepers and stuff. Do it!
Loose the anchors though, anything would be better than Marathons.
It's an 'open' event which tends to be a bit more serious and requires entry in advance. 'Club' events tend to be a bit more casual, entry on line etc.