My boys' cousins are both (two separate families) on holiday this week. They are both quite young - yr1 and yr2. But I must admit I'm quite surprised. Although strictly speaking you might say not much "work" goes on in the first few days back at school, it is a crucial time IMO for teachers and students and school getting to know each other; introductions to topics; and getting an overview of the year ahead.
Would you do this?