This is a Group Category for any Matrix related Events.
Take a look at 🗓 Discourse Event - plugin - Discourse Meta for the official guide. Essentially you can use the wysiwyg editor, click the gear, click add event and fill out the form, and it should be added to the Calendar.
Make sure that you create a new thread for the event, please. If you are a bigger event with many sub topics like the community summit, please reach out, and we can consider a subcategory instead as needed.
Any Matrix related Event is allowed. This includes Talks, Meetups, Summits, Matrix Presence on Conferences and similar.