Daryl,
Thanks for reaching out! In order to edit user roles, you’ll want to install a third party plugin for this. My favorite one is the Members plugin. Once you’ve installed and activated that plugin, you can go to ‘Users->Roles’ to edit the Shop manager role. In order to allow the Shop manager to edit Events, you should give them access to the ‘edit_others_tribe_events’ and ‘edit_tribe_events’ roles. This will allow them to edit any event, including events that they did not create.
Feel free to experiment with access to different roles, until you get the combination that you’re after. Just let me know if that gets you pointed in the right direction.
Thanks! 🙂
-Casey-