At least two concerts (complete) exists pro-shoot recorded ,two have been exhibited, Monterrey '81 it was broadcasting(few weeks ago) in a university channel in Nuevo Leon(not a national transmission) , Puebla '81 it was exhibited (not for sale) in a Queen exposition in Mexico City (videos exist, just...just wait!)
Spanish answer on Sharing The Music - Announce section ;)
Saludos Greaserkat