I agree that Wessley will have made sure in advance that this isn't going to be an event where there could be an open discussion about ME. It won't be mentioned.
BUT I do think it's interesting that Stephen Fry tweeted about Unrest and I'm pretty sure that he tweeted about ME previously to that tweet too. It may have been on a previous ME awareness type day some years ago. As I recall he tweeted something like, 'ME is a real illness..'. I remember thinking when I read it, - he must have a friend with ME. Perhaps it was as result of that initial tweet that someone introduced him to Unrest? Of course, I've no idea when it was and there is a chance I've mis-remembered.
Just thinking though, that he has an enquiring mind and if he got curious, it could be useful. Of course, his passion and commitment lies with mental health as that's his experience but he seems like a compassionate and interested type of person.