Here's a pic from last year of the school I've spent most time at in the past two years. I was there two day and asked if it was all right to come to the graduation ceremony on Friday (figuring this would be a good way to get out of an office day. Peter is doing the same for one of his schools so he won't have an office day.) They were really happy I asked, and made sure I understood that I should look as formal as possible, with a jacket at least.
I fixed up the links to my other website I posted yesterday - for some reason, this morning, they were set to this blog.... strange.