Well, reporting a bug should be done in the Forge, not the forum.
Where you'll find this bugreport: http://dev.cmsmadesimple.org/bug/view/4416
But, if I read this topic correct and look at my own CGCalendar installs, this bug doesn't exists anymore. I can add/edit entries as any type of CMSMS user.
Calendar 1.0 - Missing Modify Calendar Permission
Re: Calendar 1.0 - Missing Modify Calendar Permission
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Re: Calendar 1.0 - Missing Modify Calendar Permission
Strange thing though in my case it didn't work..