Being able to view events in the component list or the modules has nothing to do with DT Register Permissions. Those permissions are only for administrative functions.
If users can't SEE events, it's one reason... access level. This falls to the category that the events are in. If you want everyone to see the events, the category should be set to "Public" (not "Guest"). If you want just your users of a certain group to see the events, then set the access level of the category appropriately.
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