Raven Tail entered the Grand Magic Games, and they weren't an official guild. Sure, they used some sneaky tricks to do so, but that's beside the point.

[quote=AcetheKidd]
Lol,just like lucy and that one girl did
[/quote]

They summoned the spirits. If the spirits are in the actual games, it would count as cheating. And say they had to face each other.