Now that the GS open evenings are all before the summer holidays - by the way, watch out for your local comprehensive doing this as well
- I would say it was fine for you to go round in year 4 initially. We had no experience of our local secondary schools, having both been educated in other parts of the country, so with DS1 and DD we went round in both year 5 and year 6. By the time we got to DS2, though, he had tagged along with his siblings so many times and also been to various events at several local schools that he only went to SHSB in year 4.
On the subject of taking your child in to the HT's talk, please only do this if they can be trusted to sit quietly - I'm sure this is so
. When we went to the WHSB talk, DS2 and his friend were horrified by the number of people talking - and by those just getting up and walking out whilst the talk was going on
. I have to say that the acoustics weren't good to start with, but this sure didn't help! BTW at SHSB the HT's talk was for parents only and the boys were taken off for their own session elsewhere.