Calendar based access to panels

I am currently using RBoy’s rental lock automater coupled with a Google calendar / iCal link to provide rotating access to family members. Each member us their own access code for door locks/etc, and these only work for their “months” (which rotate). I’d like to provide access to a panel to allow them to set the thermostat/unlock doors/open the garage/etc, but *only* when it’s their month/when they’re staying at the house. Is there any way to do this without manually adding/removing shared access for different users every month?

If an iCal link is too hard, a CSV of emails/dates for access or similar could work... Any thoughts on how to make this work would be greatly appreciated!