Today, February 21, 2015 is Open Data Day.
What is it?
Around the globe, cities are hosting hackathons centered around open data. The rules are fairly open-ended as long as the event is open and uses open data.
Who is it for?
If you want to get involved, check the list of City’s hosting Open Data Day events.
If you are looking for some good datasets to use: try Data Sources for Cool Data Science Projects: Part 1 and Part 2.