I'm having a really dumb moment right now. I'm sure this is possible.
My client wants the companyweb calendar to be edited by ONLY his admin. Everyone can read what is on it. He doesn't want anyone but her to make changes. There will be three calendars and she will have full access over them. Anyone else will only be able to read.
Thanks for your help on such a simple question (at least I think it is but can't figure it out.)