Hmm, as I've already explained to the original author, I'm an elderly Brit.
Over here, the emphasis of Valentines' is much more firmly on adult romance -kids are neither expected nor encouraged to take part. In fact, to be fair, I expect that over here Anne Summers makes more profit from Valentines' Day than Hallmark does!
It must also be borne in mind that the Hallowe'en habit of 'Trick or treat' only really began in the UK in the 1980s after they'd all seen 'ET'! Before that, in the days leading up to November 5th, we'd had 'Penny for the Guy', which no longer happens, but Hallowe'en has become much bigger.
Maybe our Valentine will become more like yours in time but even our kids have a different attitude. There's a joke about three Cub Scouts, but I'll save that for another time...