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I like the event idea.
As for safe riding....If it is during THE bike night sponsored ride and people are doing stupid crap, call them on it. We promote safe biking and a friendly image not a "hey look at that group of @$$holes" I can find morons to ride with anytime, I like that I can come ride with responsible riders. As for after the event....when you leave, please leave nicely. If you want to be a moron, wait till you are a little ways away, then have at it; That is your choice. You may get comments, deal with it. You want to ride stupid, don't be pissed that people think you are stupid.
On the other hand, once people are outside of bike night, how they ride is not bike night's responsibility or right to punish. I can see commenting on it, but don't beat it to death and act high and mighty. Doc is right, there is a fine line. SilverGhost is right, you can only push the issue too far before you push people away and will never have a chance to LEAD BY EXAMPLE.
If a handful of people go for a ride after the normal bike night ride, even if it is with bike night people, it is OUTSIDE of bike night. Like it or not bike night can't set the rules for that. Comment on it all you want; But setting rules, No. Not bike nights place.
Use common sense, that's what it is for. You are with people being stupid, don't go with them again. Break off if you need to.
During the bike night ride, by all means, say something, tell people they aren't welcome to come on the ride, whatever. Before and after, it's your life your skin, use YOU HEAD.
Just my two cents.
But let's take this discussion OFFLINE. No need to start a public flame war. We can deal with these things nicely but sincerely in a way that doesn't alienate riders who may not be making the best choices whether out of the desire to show off or just not really thinking about other people's riding levels or the dangers involved.