The trick is to give Spot the impression that the store is further along than it actually is.
Smoke and mirrors, get cards around to everyone, take to the local union.
The more you make it look like the store it ready to organize the better.
Call the papers, tell them it's going to happen.
Get the TV stations down there trying to interview people.
I promise you will see that store explode.
It will be like dropping an M-80 into a toilet bowl.