Bike checks at spring tourney

Good call. Some tourneys don't allow exposed wheel axels either. At the London Open it was someone's job to check all bikes and issue a sticker once passed. There was frantic sawing of axels before games.
Don't wait for an accident to happen.

A bit of axle is ok within reason. I'd hate to hear about someone getting a new bike with thicker dropouts and needing to replace a hub. Tape would be sufficient for a few axle threads IMO.

Fixed cogs, flip flop freewheels, full cassettes and front chain rings are the real worry. Also uncapped bar ends with standard rubber grips...

Agree, I think people will respond well to this, especially if we have solutions (tools/tape plugs etc) available as well as just being more strict.

I'd like to see exposed disc rotors covered as well.

Full support, not a fan or random core sampling

I agree. This could be harder to achieve in such a short time frame, as well as saying it's not safe, we should see what we can do to help people get their hands on disc guards. I'm not sure what good and on the market at the moment, but I'd be happy to help with a bulk order. Does Will have any in stock? Maybe he could bring/sell/install them.

I know Will ordered in 10 boner-guards, not sure how many he has left, though i'd love to have a super cheap/free option available.

I'm sure we could easily fabricate some plastic guards (bread boards are cheap, solid and easy to work with) which would provide a reasonable level of protection. I'll have a play with this tonight.

What hazards are you thinking rotors present?
Should wheels be covered also? You're far more likely to get toes in spokes than fingers in rotors. They're not sharp. They might get a little bit warm. I can't see that they're dangerous.

Don't forget mallet checks also. Protruding bolts / screws shouldn't be allowed.