It was grand! The location was a bit hidden, but really nice. In a park and since I was late - Am I ever on time?!- everyone already had their picnic blankets out.
The evening before I was told by Neisella that she brings so much food that I should not bring anything myself. And she was right:
Although I was so afraid to look stupid with the bonnet on, I tried it on "for just 5 minutes". I ended up wearing it almost all day!