You need to be an organiser of the organisation, and the post is added to an existing event.
1
Open the Posts tab
From your event, open the Posts tab, then click Create a post.
2
Fill in the post
Give the post a name and, if you like, a description. Leave Restrict to teams on None (open to all) to open it to every member, or select one or more teams.

3
Create the post
Click Create. The post appears in the event’s list of posts.


