September 22 is World Carfree Day

Today leave the rustbucket at home and walk, bike or take public transport to work. This is better for the environment, healthier for us, and much more social, since sitting in your car doesn't give you a chance to meet new people.
Here in Warsaw anyone who shows their car's documents (meaning they left it at home) can ride the bus, tram and subway for free. Plus, there will be more bus lanes on the streets, leaving less lanes for cars. On Saturday and Sunday we had Public Transport Weekend, with antique trams and busses on the streets.
How does your city/area celebrate Carfree Day?