Re: time zone question
You (and each member) can set any time zone you like for viewing your calendar at the bottom right. There has to be some sort of default if nothing is chosen, so PST is as good as any. I believe the calendar used to be tied to the group TZ setting, but that caused problems for some people, so now it's a separate setting for the calendar. Basically another option to make the groups as flexible as possible.
GMF's Wiki: https://groups.io/g/GroupManagersForum/wiki
Search button at the top of Messages list
A few site FAQs: https://groups.io/static/pricing#frequently-asked-questions