lowed/tolerated, it's not a hard boundary, the emphasis is that you publish your code/work before you perform (your patches, code, artwork used, schematics - whatever is relevant ), usually on the day. It's also good form to do a quick intro about what you do & how you do it.
It's a pretty freeform night, just to show what you are up to, or test out something new or experimental, people just sign up, publish and play - it always good to fit as many people in as possible, all depending on how many people enrol.
You sign up on the WIKI here:
http://xwiki.sentinelweb.co.uk/bin/view/OpenNight/Signup
Just make sure to read the RULES - it sort of defeats the purpose if people turn up with *just* closed software.
or just leave a comment.
We will also have a thanksgiving bent for the Americans out there. Hopefully with turkey but is not confirmed yet.
--
best
Rob