You can find the online proceedings of past CLPsych workshops on the ACL Anthology.
The proceedings of the 2019 workshop are at aclweb.org/anthology/volumes/proceedings-of-the-sixth-workshop-on-computational-linguistics-and-clinical-psychology/.
The proceedings of the 2018 workshop are at aclanthology.info/volumes/proceedings-of-the-fifth-workshop-on-computational-linguistics-and-clinical-psychology-from-keyboard-to-clinic.
The proceedings of the 2017 workshop are at www.aclweb.org/anthology/W/W17/#3100.
The proceedings of the 2016 workshop are at www.aclweb.org/anthology/W/W16/#0300.
The proceedings of the 2015 workshop are at www.aclweb.org/anthology/W/W15/#1200.
The proceedings of the 2014 workshop are at www.aclweb.org/anthology/W/W14/#3200.