As a datapoint, this would have been highly useful to me before writing this: EA Mental Health Survey: Results and Analysis. Can you have a look at it regardless?
Interestingly, regardless of when you make the offer publicly, there is someone who will have published something at t-1, so I don’t feel too bad.
As I mentioned in the post, it’s helpful if I know what I should be looking for. Is there any particular type of feedback that you’re interested in?