Do managers need to have a detailed breakdown of when religious festivals occur and an understanding of the main religions?
There is no particular need for this, but it may be helpful to discuss the needs and requirements with your staff to plan for cover where there is likely to be a demand for time off by a number of employees at the same time. Discussions with staff are important because of different attitudes towards the same religion. You should not therefore make assumptions. Information about the main religions and festivals is available from Human Resources.