My reviews for MMGM, Marvelous Middle Grade Monday, under the Magical Gazebo this week include three books that all involve going through a portal or transition to a land beyond. They couldn’t be more different than one another but each has a distinctive experience in another land, powerful lessons they learn there, and key decision points that will change their lives forever. Circus Mirandus by Cassie Beasley A dying grandfather shares amazing stories of a circus with an invisible tiger, a flying birdwoman, and the magician called The Man Who Bends Light, stories that may in fact be real. Young…