Ar$e! 
I'm going to be away that week (am being naughty and taking children out of school for a holiday with friends who don't have school-age children) so won't be able to make it.
It is my wedding anniverary that day though, so wherever I am I can guarantee that I'll be having a drink and will have one for you all having a nice time without me.
TBB - I'm sorry I'm going to miss you on your trip down, it would have been great to meet you. You'll have to come again! 