In Lewis Carroll's book, Alice is at the trial because the Gryphon takes her there.
...a cry of 'The trial's beginning!' was heard in the distance.
'Come on!' cried the Gryphon, and, taking Alice by the hand, it hurried off, without waiting for the end of the song.
'What trial is it?' Alice panted as she ran; but the Gryphon only answered 'Come on!' and ran the faster
In the 1951 Disney version, the Queen of Hearts demands that Alice be tried for making her look foolish at the croquet game.
This Is Alice - 1958 Trial Balloon 1-18 was released on: USA: 1958
She's dead.
Trial of the Detectives happened in 1877.
Outreau trial happened in 2004.
Treason Trial happened in 1956.
Trial of the thirty happened in 1894.
Gadget Trial happened in 2006.
JBTZ trial happened in 1988.
In the original book it isn't explained why Alice has to attend the trial of the Knave of Hearts, the Gryphon just takes her there. In Disney's 1951 animation, she is the one on trial. She is accused of tripping the Queen of Hearts during the croquet game.
Alice in the Country of Hearts happened in 2009.
Alice no Paint Adventure happened in 1995.
American McGee's Alice happened in 360.