Ayup All...
Gandy already knew about the Meeting. According to the book, he'd already discussed it with the Dwarves (Before Carrock he says) so whether it was during the argument about 'leaving' Bilbo behind in the Mountain passages, I don't know. It seems the only time they'd had to after escaping. Unless Gandy'd talked to Thorin at Bag End or before, and not mentioned it to the others...
