Hey Henri,

All the links in the "toolbar" are for site wide specific. For instance, if you click on the "Events" on the toolbar, it would list down events from everyone on the site. If you already have menu for this, you should disable the toolbar

The "Events" link on the profile header would list events created by the user. For instance, if I view your profile and want to view events created by you, the only way is to click on this link.

The last "Events" link on the story form is to allow users to create event using the story form. They are all for different purposes.