The biweekly calls for the Citizens and Token house provide one of the best place for Optimism ecosystem updates. They are hosted by OP Michael.
Recaps and videos from each call: https://gov.optimism.io/t/optimism-community-call-recaps-recordings-thread/6937
The zoom links to meetings are posted here: https://gov.optimism.io/c/updates-and-announcements/55-category/55