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I appreciate that in this case it would be best to ask the organiser, but surely it isn't always a bad idea to raise a query here first?
There may be someone who can give a definitive answer and thus save troubling the org who is probably quite busy in the run up to their event. It also means the answer is "out there" for anyone else with the same query, possibly saving several more emails to the org?
An answer is only definitive if the questioner knows it's definitive. A questioner who is asking newbie questions on internet forums is very seldom going to have the prior knowledge to work out who is and isn't talking crap - so even if the person answering their query is very well-versed, the amount of reliable information now possessed by the questioner is still zero.
To give an example from a slightly different case: someone I bumped into on facebook is currently spending several £k on a new bike, because he tried to get a bike fit off one of the facebook time trialling groups; there were some people on there talking sense, but many more talking rubbish, but he chose to trust them.
I've organised events and received my fair share of silly emails, but if an organiser is getting several emails asking the same question, they should have put that piece of info on the event webpage, or made it more prominent, or more explicit. To lapse back into time trialling, that sport is several years behind Audax in this regard. Courses are still known by codes (e.g. V718/1), which is all well and good except that lots of them don't have maps, and are only knonwn by a description such as "Start by the third drain cover after the lamppost after the turning from Cartwright's lane" - i.e. completely useless for learning the course from a map. A lot of the descriptions are either misleading, wrong or absent from the internet - you're supposed to find out from the cycling club secret squirrel network or somesuch, and if you're not closely connected enough to that network, you're screwed. Yet suggest that organisers should all provide maps of their courses and you'll provoke howls of derision.
If a piece of information can only come reliably from an organiser, participants deserve to get it from the organiser. No ifs, no buts.