Followup, at KNCO: Problems Suspend Toy Run for Next Year (throwing candy, candy mess on roads, bikers w/o helmets)
If you don't want to get stuck at an intersection for a half hour or so, you need to avoid travel in & between our towns starting at midday today - the toy run starts at noon in Nevada City & goes to the fairgrounds ("1:00-3:30 pm"), circuitously and without ever stopping to let motorists (or peds?) through.
I once asked a participant how long he thought was acceptable, to have motorists wait; he refused to answer.
I looked on the Toy Run website for a map of the run, to see what routes if any are still available to drivers while the run is in progress, but the only map they provide is one showing how to reach the [Rood Center] starting point.
Putting on my Keachie hat, what the organizers could do, if they wanted to avoid inconveniencing the community, is divide the bike traffic into 10-minute "slugs" at the outset, with 2 or 3 minutes in between; then the ride could still be nonstop for the bikers, but cars could still get through while the ride was in progress.
And providing a route map - ideally with estimated start/end time the bikers will pass through each segment - would be helpful too. (Does Google let you do animated route maps?)