It's a bit like taking children on holiday in Term time? 'could be doing other classes' - no education is wasted.
Holiday involves deciding what to take B4 packing the cases; checking passports/visas; looking at maps to see where they are going; the choice of travel; mixing with others; trying different food stuffs
Nativity: helping Mum making costumes even if it's a Tea-towel on the head for the shepherds; learning about the spices taken to the Stable, the spelling of which still goes by me
; learning about different countries involved in the story.