I was really surprised that there were gluten-free bento boxes at LinuxCon.  I had selected this option when registering but getting gluten-free food in Japan can be difficult.  The bento box I received on the first day was incredibly good, good enough that I’ve looked up the company it came from so I can buy from them in the future.  There was a problem with box labels on the second day but the conference organisers went out of their way to fix that for me.  And on the third day one of the conference staff, when they couldn’t find me in the lunch room,  brought my lunch to me as I was sitting outside the room I was going to speak in.  A conference lunch that made me want to say “wow”.