I’m not sure about extending the season with it already being a bit longer ( I think) due to the World Cup. Owt is possible till we hear officially though.Pretty sure the 10 day period of mourning up to the funeral will state no sporting events in that period.
So if the funeral is Saturday they COULD rearrange for sunday. But I reckon they just postpone all 3 rounds of fixtures and push them to next year. They could feasibly decide to extend the season to accommodate considering its every team in the country affected