My god-daughter is graduating from university tomorrow... not quite sure how one of my friend managed to have a kid that old... :).

I'm going to the ceremony and then out to dinner with her and her parents (my friends).

What does one wear to this type of thing? The weather is going to be a whopping 14C, and cloudy. Heading down to 8C overnight, so could be quite cool when we head home. Too cool for a summer dress. Any advice?