will the new updated permission set perhaps allow us to post as a community
When you publish, the channel event announcements are currently posted by the Tightknit bot and uses your community name. Are you referring to something else?
is there a way to standardize the event time?
Unfortunately no Slack doesn't let us specify timezone in their date inputs, despite how much noise we've been making for them to give us one 😞 The way it works today is that users will see the event date in their own timezone. E.g. being in Cali, I will see events in PST both in slack and on the companion site.