I think the case you are talking about is a deaf mom lost custody of her kids and the foster parents and school wanted to implant the children. That case was wrong and those kids never got implanted. In that case you had parents of children with cochlear implants go to that court and tell the judge that they could not go that that they had to respect the mother's decision.
I don't see anything like that in this link: Newsflash and the 300+ emails to the judge weren't admissible however the Legal amicus curiae ("friend of the court") briefs filed by Deaf-rights and disability-rights advocacy groups were admissible. I don't think the letters send to the judge were admissible since there were no mention of the letters being submitted in the court.
Many deaf people and hearing people who side with Larsen show their support by attending the hearing and the rally as well.