Hi,
I was wondering is there a designated date when people around the world celebrate Bitcoin invention or creation of cryptocurrencies in general? I mean commonly accepted tradition, something like
International Programmers' Day:
Programmers are greeted with positive comments like Happy Programmers Day in some work environments on International Programmers' Day. The observance is also mentioned among programming communities in online forums and social media, including on Facebook or Twitter.
I think it would be fun to have such a day for the crypto community

No we don't have any such day to remember the greatest financial invention of this decade because we live everyday with bitcoin. May 22, is the only day that is celebrated as bitcoin pizza day. If you are willing to know the story behind it, try googling it.
But I have a great idea to celebrate a day dedicated to bitcoin. While most of such "days" are constant in nature, lets have dynamic days for bitcoin that will change every year. The idea is to pick a date in last year, when the bitcoin price reached the top position.
For example, bitcoin price reached its peak value on 17th December last year. So the bitcoin day will be celebrated on the same day in 2018 to remember the best performing day for bitcoin. For 2019, we will pick up the date from 2018. How is the idea?