Notification of upcoming workshops

As of about a year ago I signed up to be notified about upcoming workshops. Every once in a while I check the listing of workshops but they are always sold out. I have never gotten a notice when new workshops are scheduled so I get there too late. I thought maybe my signing up was not working so I have signed up for notification several more times. Is there some other way to learn when another set of workshops will be scheduled so I have a better chance of finding out before they are all full?