The organizers’ slack is for organizers, the community slack is for all R-Ladies.
You might want to create a discussion space for your own chapter on Slack or another platform.
It can be a place for discussions, collaboration, Q&As, regular scheduled messages, etc.
In this platform, make organizers easy to identify (e.g. adding “Organizer - " to your names) which is important in particular if a member wants to report an incident related to the code of conduct.
In any case encourage the members of your chapter to join the community slack!
If you wish the local slack workspace to be only for women and gender minorities, be explicit about it. You might want to read the phrasing used for the community slack, see also the form used for sign up