All the event info here is on the website.
Check the events listings (whats-on)
If what you are looking for is not there tell the promoters to add it
(anyone can list their events here and listings are free - all they have to do is use the "add event" forms to enter them)
There is no general or city/area-based email list (who has time to do that? - any volunteers?)
Presently the only active mailing lists are those individual party organizers get with their listings and only some of them actually use those lists.
To sign up for those those lists you add your email address on a form linked from the info page of one of their events.
People who add events (if they added their events themselves and were logged in when they added their events) have access to a mailing list function where they can send mail to people who sign up to receive more info about their events (they don't actually see the addresses and can only send email to people who sign up for THEIR events)