[H-GEN] Libraryhack 2011 24hr Lock-in, next weekend at The Edge

[Russell Stuart]

On Sat, 2011-05-21 at 13:50 +1000, Clinton Roy wrote: 
> One of the oddest things I've done at The Edge is coming up next
> weekend, the Libraryhack 2011 24hr Lock-In.

I feel like a dill for asking this, but what is a Lock-In?  Googling the
term brings up page after page of Lock Smith ads.  The only other
references I can find say it is name for a particular style of end of
school semester party popular in the US, where the kids are literally
locked into a room so no one can get in or out, usually overnight.