One of my friends is resurrecting Barjacking! Below is an explanation. Here's the Tribe to subscribe to for updates on when the events will take place:
barjacking.tribe.net
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First we gather as many people as possible at a meet up spot, at 10:31PM.

We gather to vote on a few bars. Once the voting is done, we leave promptly at 11:00 PM to go to the selected location.

Once we all arrive at the selected bar, we meet outside together. Once we have a mob gathered, we bomb the bar with drink orders all at once to distract them, while the few of us roll in speakers, and turntables, and set them up in our scoped out location.

The bartenders and staff are usually too busy being overwhelmed by so many people, that they don't even notice us hooking up tables, and sound. By the time they do notice it's too late, and we have successfully jacked their bar.

We believe that once the bartenders, owners and other staff realize that we are bringing them the green, they won't bother us, and they will let us do our thing.