I think that's more of a business venture than a Real Estate issue. I believe people looking for a space like that look under "Banquet Halls" in the phone book or on the internet. Craigslist ads only post for a week but you can keep re-inputting them. Peole who put on such events like caterers or wedding planners might be worth contacting. Good Luck.

As someone who advertises on a daily basis, your local newspaper would be a good start, followed by the area chamber of commerce. If that doesn't work, try to find an online newspaper in the area. The chamber idea will be the least expensive since most of the time they will advertise this as a community service.