I feel very guilty now.
Dh went to two schools in 2005 and two schools in 2006, and we all went to an Open Day of small independent school (I).
Then based on all info we arranged to visit I and one other (S) during the school day. Both times were shown round by senior member of staff who answered all our questions, which was very interesting, 'real' and pleasant.
So today we took ds1 to the Open Evening of S ... It was heaving. Crowds and crowds of people (they admit 210 and are over-subscribed), every open classroom was busy and I generally found the whole experience rather unpleasant.
Dh says all the Open Evenings are like that
I'm so glad I delegated the job to him. I've no desire to go to another one ... ever!