@CharleyHamilton is correct; upgrading the calendar module is in the development backlog.
We work around this restriction by having a dummy adult account for the PLC’s usage. It’s got the “committee secretary” role, and view profile and view advancement for all the Scouts. That let’s the PLC members update the calendar, message all the Scouts, leaders, and parents in the unit, and run advancement reports to help with troop meeting planning.