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Seems like it would be a simple inexpensive investment (probably completely outsourced) for YC to set up fortnightly (down from Tuesday dinners/weekly) dinners for founders of a single batch to come and report updates to each other.

I recall reading somewhere that YC batches are now split into clusters because there are so many companies in each batch. Maybe these dinners can be cluster specific as well.

As the companies grow in size, they can democratically decide to reduce frequency to monthly - I can see how changes would be slower as the companies become larger.

Edit: To clarify, this is purely a peer group - no YC presence needed. Have to do it this way to scale.