Just click the message at the bottom of these emails that says, "stop sending notifications about these kinds of emails." This works on a computer screen. On a hand-held device, this message would be too small to read.
You need to do this several times before all types of unwanted emails stop arriving.
You can also click 'Stop Notifications' from any particular post on the event page
(This option becomes available to you only once you like/comment under the post.)