If you own a winery, one way to get (free!) publicity for your events is via LocalWineEvents.com. I've even used it to raise awareness of a fund-raising event that my spouse is organizing for our daughter's school.
I also believe that RSS (Really Simple Syndication) is A Good Thing, as Ms. Stewart would say, and I'm pleased to tell you that the latest iteration of LocalWineEvents.com provides an RSS feed (i.e. automatic updates - all you need is an RSS reader like Bloglines) for each city and region that they cover. You can even add their list of events to your Web site, as a service to your visitors.
Anyway, if you hold events at your winery, you could do worse that posting them on LocalWineEvents.com. to gain additional visibility (or take advantage of their ticket selling ability). Joe Bob says "Check it out!"
(By the way, I have no affiliation with LocalWineEvents.com, other than having used it to post my own event, and being a recipient of their e-mail notifications for Sonoma County.)