The First public Data Release is available as of Aug 14, 2020:
GOGREEN and GCLASS First Data Release
Reduced spectra, images, and catalogues with advanced data products for both the GCLASS and GOGREEN surveys will be made available. There will be a public workshop dedicated to the release and first science results, Aug 24-25. For the full announcement, and to register, see https://uwaterloo.ca/astrophysics-centre/events/gogreen-data-release