Re the debate on holding on to offers / letting them go, someone a few iterations ago of this thread earlier (apologies - I can't remember who) made some really good points that are worth reiterating for those who've recently joined the thread.
They made the point that visiting schools for offer holders' events is completely different from going to open days - you're in the driving seat, you can ask questions, and they now want you rather than the other way round. Sometimes that change in dynamic changes the way you see a school. Sure, it might not make you choose your 6th choice school, but it may change your views about your top 3.
Secondly (and I thought this point was excellent) much as we all hope our DCs settle happily into their chosen senior schools, sometimes it just doesn't pan out that way, and on the off-chance that you might be calling one of your rejected schools one day to ask about occasional places, it's useful for you to have seen it at an offer holders' day, and it's useful for you not to have rejected it out of hand the first time around.
Obviously the message isn't "hold onto 6 or 8 schools, even those you'd never actually want to send your child to." But there are legitimate reasons why people might want to see 3 or 4 schools at offer holders's days before deciding, and given how hard the DCs will have worked to get that far, it feels fair that if that's what they want to do before making a decision, they shouldn't be judged or criticised for it. The sense on here is that it's always an inherently selfish thing to do. But people make decisions in different ways, and if some families want to go to multiple offers days before deciding, then I think that's their prerogative.