The ACLU has intervened in the case of a lesbian high school student in Alabama whose principal has forbid her from attending prom with her girlfriend:

"Cynthia Stewart, a 17-year-old junior at Tharptown High School in

northern Alabama, is a member of her school’s prom planning committee,

had personally raised over $200 for the prom, and created the theme her

classmates had chosen for the dance. She is also an out lesbian. When Cynthia approached her principal to ask if she could bring her

girlfriend with her to the prom, he said no. He also made Cynthia

remove a sticker she was wearing that said, 'I am a lesbian,' telling

her, “'You don't have that much freedom of speech at school.' Cynthia’s

aunt and guardian, Kathy Baker, then appealed the principal’s decision

to the school board. But the board let the decision to bar Cynthia

from bringing her girlfriend to the prom stand."

The school has apparently threatened to cancel the prom for everyone should Stewart bring her girlfriend.

UPDATE: School reconsidering request!