groups to update calendar

Hello, I’m using the Calendar plugin and I’m wondering if anyone knows how to allow a certain user group or user to have access for updating the calendar only- in other words their only job is to update the calendar (that is password protected) and only the calendar?

Any ideas on limiting a user or group of users to do only this? I’m using User Access Manager to create groups.

Just as an example, I’ve seen this plugin for control over Next Generation Gallery using User Access Manager.

https://www.ads-software.com/extend/plugins/user-access-manager-nextgen-gallery-extension/

Thanks,

Tessa