According to the PMBOK Guide, the resource calendar is a component of the resource management plan that identifies the availability, capability, and skills of human resources, as well as the availability of physical resources. The resource calendar may be affected by various factors, such as organizational policies, holidays, vacations, and work shifts. If the project team members enroll in the work-from-home policy, the project manager should update the resource calendar to reflect their availability and working hours, as well as any potential impact on the project schedule, budget, quality, and risk. The project manager should not update the communication styles, roles and responsibilities, or stakeholder engagement plan, as these are not directly related to the change in the resource availability. References: PMBOK Guide, 7th edition, pages 309-310,
313-314.