InnerSource Commons usually use Eventbrite, but it's not that common in Japan, especially when it comes to community event. We usually use TechPlay and connpass to get the information about events.
Here are the features of each
You can create private events on TechPlay. Private events are great for events for Slack members. Especially #jp-marketing content, etc.
You can also post events created on a different service on the TechPlay site.
connpass is a very well-known site with community events and widespread recognition from developers. connpass is good to use for organizing regular meetings.
About Event Pages
InnerSource Commons usually use Eventbrite, but it's not that common in Japan, especially when it comes to community event. We usually use TechPlay and connpass to get the information about events.
Here are the features of each
Pages
Event pages are managed by @yuhattor and @bory-kb