Why not your birthday itself? I think it's pretty symbolic to go out on the day that you were brought into this world.
If i choose to CTB in my birthday there will be dozen of people trying to contact me in that day, and that will generate unecessary stress for everyone.
If i choose 2 days before, the process will go smoothly.
Deciding a date doesn't work.
Pretty much no one who sets a date ever follows through. We can only go when we are 100% ready and all hope it gone.
We don't even know what our SI will be in 10 minutes, let alone in the future.
I get your opinion and respect it, but IMO there is no such a thing as being 100% ready, since SI is present 100% of time. This "im totatly ready" thing is an ilusion. You will never be 100% sure and prepared unless you have an impulsive attempt (and we all know that impulsive - not planned - attempt is high risk of failure).
If you plan ahead (everything, incluing letter, funeral arrangements , living will, N, AE, benzo, etc) that means that you are somehow prepared.
If you dont plan ahead, there are a high probabily that you will postpone forever and be stuck in this shityhole until you are very old or till u run out of money and go homeless.
CTB is probably the hardest thing to do in life, so not planning it make it even harder.