This article was originally published in April of 2018 so the December concert referred to has already happened.

https://www.king5.com/article/news/local/seattle/seattle-singers-passion-project-to-help-special-needs-kids/281-535255240?fbclid=IwAR2V-ZeQX5_-GwTWVCO2mHThL0hUfHOiIppCJDUsc88tBu0XuINE2AIUsdc