I first learned about ungrading from my the APA's Society for Teaching of Psychology facebook group, and they had so many conversations around this that they started a slack channel. I haven't kept up with it but they use specs grading, which is perhaps a better fit for larger courses. I tried a version of this during remote learning in 2020. Here's the slack channel if you're interested in joining those conversations: https://join.slack.com/t/specsgradingi-pm17499/shared_invite/zt-1wqybjovp-RXBIkLwF0vxmERppKBMGWw