I co-ran a music festival that had an open call. We used google forms (yies, i know, I'd use Easy Chair now) and recruited a bunch of people to do peer review. Every submission got scored by 3 people on a few factors.
We also found systemic gender bias even when the identity of the submitter was hidden. It was a tech-focussed festival, but we needed to add a specific question to the reviewers about aesthetics, which was extremely helpful in addressing the bias.
@alxd in general, the submissions by men tended to talk more about technical aspects and ones by women tended to talk more about aesthetic approaches. Women reviewers tended to treat these approaches as equal where men tended to give too much weight to technical descriptions.
@alxd Finally, because concerts need to be "curated", we eliminated anyone below a certain score and then passed everyone to the concert programmers, who came up with themes and picked acts that fit them.
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