So was there another plug-in occupying the same place?
For anyone else who has similar problem, but the above doesn't fix it another reason why the menu might not appear is because the user lacks teh permissions to edit events.
When the plug-in is installed, admins should be given the appropriate permissions. They can then allocate permissions to over users in the plug-in settings. If you can't see the events menu tab (and the above doesn't fix it) then ensure you've been allocated the appropriate permissions.