This year, we are thinking of changing the Edinburgh date from August 23rd (or closest Saturday to) to a mid-june date - the reasons being numerous and based mostly on cost and availability of accomodation in Edinburgh in August.
I have chosen the date Saturday 12th June for now, though this is up for being changed if enough people need it to be. Discussion of DoD is as usual still mostly done on the dedicated board on POEE, but for exposure to more people who may or may not want to come up for it I'm posting it here too.
NOTE: There are still plans to run a second DoD event in the southron reaches of the UK this year, most likely around the traditional August date. As I will probably have my hands full with "Movin' To Southampton" plans around that time it may make more sense for someone else to arrange it.