Whitsun (or Pentecost) is a moveable feast, and therefore the holiday dates shift each year. To find out the specific closure dates for a particular school, you need to check:
* The school's website or calendar: This is the most reliable source.
* The school's newsletter or communication system: Many schools communicate closure dates to parents through email or a similar system.
* The local authority's website: The local education authority might publish a general school holiday calendar.
Without knowing the specific school you're interested in, I can't give you the dates.