Originally Posted by
hanna
Broadcasts
Use of the broadcast system should be limited to advertising in-game tournaments and events. Advertising market items, requesting duels, making non-event related announcements, or any other uses of the system will result in a ban. Broadcasts should also not contain any profane language.
So no, you cannot use the broadcast system just to gather other people to play games. It is to be exclusively used to advertise in-game tournaments and events.