So there is a big group based on the fandom of my little pony
My Little Pony is based on the toy franchise based on dolls and play sets. It aired on Discovery Family. What is the name of this fan group?
Friendship is Magic.  It is actually mostly for adults and cosplayers
It was a tv series based on My Little Pony and it also aired on Discovery Family. Do they have events and get togethers?
They have conventions.  One of the major ones is called BronyCon.  
So BronyCon meets annually in the United States for fans of the show.
Yes.  It is on the east coast.  Brony stands for bro and pony
There have been eight events with one that had over 7600 attendees. Since brony stands for BRO, does this mean most of the fans are male?
Yes.  The term was popularized on 4Chan.  It surprised the makers of the show that they had attracted an audience of adult males to the show
So 4chan is a forum where the users mostly post anonymously.