We used to take our kids with us to family and friends and put them to bed there ,picking them up wrapped in blankets later. My DS does the same ,but my DD does not - she has a set bedtime that is stuck to rigidly .All DGC are happy and active. So I'm sure it's what suits each individual family. But I love seeing all the generations enjoying a meal together in a restaurant when on holiday abroad and wish it happened more here in the UK .
People eating and drinking on the go