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there is no error, the feature does not seem to exist.
I create a private group, invite members, members join. In that group I create an event - I would like to invite all the group members to that group event, but there is no feature and I don't understand why since there is an invite feature for normal events.
And It seems group events don't get recognized without an invitation in my community.
Did you made any modifications to our php files? Since "events" menu is missing from a group page, which is strange since event sharing is enabled on your site.