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I would email the ITO immediately and raise your concerns, i.e. that the risk assessment and the route map for this ride fail to reflect the reality on the 'road', and that in your view there are significant risks to participants should the ride go ahead in its current format. Give a few key examples. I think it only fair you give the organisers the opportunity to do something about this (whilst at the same time fulfilling your own duty of care).
You need initially to complain to the scheme that asked you to do this with such poor risk assessment. To escalate you need to contact the Bikeability Support team contactus@bikeability.org.uk