I've created a group of about 25 folks.  I would like all of them to be able to access the same calendar and make changes to it.  When I try to share the calendar, I don't seem to get the option to share it to a group like I do when I try to share a document.  Do I have to share it to each individual email address?  What a pain since the group is likely to grow, and I will have to keep updating the calendar sharing.   Any help would be appreciated!

Thanks,
James