5) real pest if you can't get to one in year 6 / clashes with another event
That seemed to happen a lot here. 2 secondaries of 4 in the town having their open evenings on the same night - you'd think they would coordinate dates to avoid clashes when they're that local to each other wouldn't you?
Or when they set a date which unavoidably clashes with something else - we had one this year which was on a Saturday, and with no options to even do tours at any other time. That particular day happened to clash with a national championships sport event which ds's training had been building up to for a while. As it wasn't going to be our first choice, or even our second, we didn't go to it. But going in year 5 would have given two bites of the cherry.
We did find though that in year 5 several of the secondaries organised events which the Y5 kids went to with their primaries, so they had actually already visited most of the local schools in a more cursory fashion and had come away with opinions formed on those visits. I was surprised at how definite ds already was, before the open evenings, on what his personal ranking of the local schools was - and how closely that actually matched mine which based on a different set of criteria/judgements.