I also like the idea, however it just came through my mind that as far as i know FIAT doesn't have like fiat day or something like that. So why would us? Tho if we are going to take it further like business innovations then it might really be a good one. Or if the topic is all about the improvements using bitcoin as a medium
Having a bitcoin day is good idea for all people who use it.If there a bitcoin day it may cause to spread the bitcoin to world and some people will get interested in bitcoin. Everyone will be happy if theres a bitcoin day and it will help to gain more investor.
I don't think there would be a official bitcoin day but users could actually made one because a day would be only declared or legalized is when do government would able to announce it but knowing that most of them are against about bitcoin then for sure they wont really mind on creating it that's why as bitcoin users we do already know on when bitcoin was made.