Rather than your sterile "what do you think about our website?" lead ins to transparently try and get us to look at your website and so, somehow, by some kind of voodoo, feel the need to ride the sportive there are other ways to promote your event
1) some nice photos of last year, people having fun, smiling that kind of thing
2) review of the event last year, tales of pies etc
3) what kind of stuff the $$$ raised is used for as it is a charity event
4) get one of your real entrants to come on this forum and say "I'm doing the Kidscan sportive thing, are you?"
5) stats. Slowest person last time. % cloud cover. etc etc You'd be surprised how much more people are interested in that than the minutiae of your webpage