Many people who have bitcoins do not have an idea about this date and do not care about it, I on my own do not see any reason why an investor in bitcoins should have this date in their head when it is not something that can increase the bitcoins they have. If you know about the date, you can personally have your celebrations, there is no need to make a big deal from it. There are better things that can be celebrated about bitcoins and we hope to celebrate acceptance and adoption of bitcoins above everything else.