SocialCoop has a shared calendar for organizing working group meetups and coop wide meetings. If you are organizing work in the co-op you should feel empowered to add events to the calendar which will help let other co-op members know about the meetings.
You can view the calendar by visiting:
You should be able to use the same URL to subscribe to the calendar in your calendar client.
If you would like to add or modify events on the calendar you will want to get added to the May First Nextcloud Circle either using your existing May First account, or a SocialCoop sponsored account. See the May First page on how to do that.