Is there a general way to find or get notified of relevant conferences and meetings in your field?
Many professional societies publish lists of upcoming conferences in their magazines and/or journals, and send monthly emails with information that usually includes calls for papers for future conferences. I assume one would be interested only in conferences in one's field. I would expect that one would know about the professional societies in one's field and how to receive notifications, although in many if not most cases such notifications go only to the society members. 

Moreover, other conferences in one's field can be identified in Google Scholar by where the relevant papers have been published. Then the most recent (at least) web site for such conferences can be found with Google. The date and venue for the next conference in that series is sometimes posted on that web site.