Is there a general way to find or get notified of relevant conferences and meetings in your field? Here's the problem: I don't know what are the relevant conferences and meetings for me to potentially attend/present in. Every conference I've been so far has been passed down to me by a much older professor who knows it by experience.

I feel like this is an important topic, and yet all the tools I tried to use to find conferences (such as allconferences and conferecealerts) fail to find me relevant things.

Is there a method to reliably find relevant for you conferences worldwide?
Ideally it would be good to get notified when a new relevant conference is announced.

I know there are some websites (such as arxiv-sanity and google Scholar) that suggest papers for you to read based on previously loaded papers, so I wouldn't be surprised if there was some similar tool where you put some conferences with a few keywords and it spits out suggestions.

Cheers
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.