@jessamyn @wikimediafoundation
Good question. I think Wikimedia-l is probably still a decent place to reach folks affiliated with many different orgs:
https://lists.wikimedia.org/postorius/lists/wikimedia-l.lists.wikimedia.org/
Individual affiliates also often have their own lists, many of which can be found here:
https://meta.wikimedia.org/wiki/Mailing_lists/Overview#
But I'm not very involved these days - maybe other Wikimedia folks seeing this thread have other suggestions for places that are more likely to reach the right folks, or to have good/constructive vibes.