alright here is the scoop,
first thing find at least couple more people who are willing to work on this idea ( is time consuming and at times disheartening and you will need these other people to carry on when you need a break)
find a club that is in need of customers, or select a night that they are not busy, talk to the owner and offer to bring some people to their place of business if they play some salsa music, provide the music ( we pre burn the playlist and then we can let the cd run and put a new one every hour or so, 4 cds will be plenty for the night) offer to give a short class before the night starts
Make sure you get a couple of leads, so they will keep the ladies entertained during the night, provide training if need it.
talk to the local YMCA, Spa, and offer to give salsa classes.
check out the local ballroom, swing and other dance communities, some of them are interested on learning salsa, so go to their dances and make friends
find the local radio station that plays jazz or latin music, give them a call and ask them to announce the "latin salsa night"
encourage the people to buy drinks/water/soda and make a point to tell the club owner that you are doing that, that way the owner feels that you and her/him are in the same page "business wise"
We are a town of 30k people, with a local university and a few of us know people who are interested on partying, the first night we had some 20 people I think, 4 weeks later we had about 40 to 50 people, then school ended and we had only 6 people, we have climb to 10 to 20 nowadays
Dealing with the club owner can be a hassle, people complaining about the playlist is another, having to teach when you could be training yourself is right up there.
take pictures, setup a website, print flyers.
delegate responsibilities, marketing, playlist, classes, should not be done by a single person as it can be quite overwhelming
is rewarding but at times it can be stressful, I almost end up hating it because every Wednesday I would be freaking out that not enough people will show up to keep the nights going. Eventually I decided to take a break and lucky the other two people took over the helm, while I just supported their efforts.