Potaytoes / potahtoes -  both are right.
I'm just going by Mr. Haynes reckoning and according to what little has been said by him they are going to put on one heck of a 20th anniversary show this year with the usual Pre-jam night but two nights of the Christmas Jam itself.  
The tickets and info usually go up the week after Halloween so will see then I guess.  Have an enabler kind of friend who wants to go - haven't dared look at airfare yet  . . . .