Have you done it?
Are you thinking about doing it?
What's your opinion about it?

...send someone, or be sent on humilating tasks.
Observe dominance/submission protocol in a restaurant.
Use submissive positions and body language.
Walk around sporting a collar with D-rings or other accessories. Restraints, chastity belts, inserts.
Use a remote control for hidden toys that buzz...

Dynamics – What's the purpose of the public? Do you want something to be noticed? Is there a challenge to keep something hidden? Is it the thought 'If they knew what I know...'

Knowhow – Preparation, toys, action. What and how?

Ethics – It's not possible to get prior consent from accidental passers-by. People who don't know you from a bar of soap don't know anything about your relationship. What's okay for a public scene? Where are the limits?

Local Laws – What do you need keep in mind where you live, to keep the cops out of your scene?

Emotions – What's the special thrill of a public scene?

Your ideas for and about BDSM in public...

This thread is a sort of generalised spin-off from part of the discussion in Tracy Lawrence Banned from Oregon Airwaves