between 1130 am and 1145 am is pretty good, but check first to see if its a hotel, in which case that's no good at all as the bed will need changing, if its a hotel venue then 3pm - 330 is the optimum time to book.
Anything after 11 pm is a bad idea, then you are into the twilight zone (the millennials wont even know what that is).
But really? who knows, its a bit like selling houses, you are in a chain, the person in front or behind you in the chain (queue) could ruin the whole thing by being a dick.