The monthly SF Bike Party ride is tonight — apparently they are adopting a “tweed” theme, after the tweed-cycling subculture. In the US, tweed cycling is kind of a vestigal offshoot of steampunk. In the UK, “Tweed Runs” are attire-themed rides, where people dress in moderately old-fashioned clothes (according to Wikipedia).

So, the Bike Party is tonight, and the SF Tweed group is riding on November 6th (see Facebook for details but don’t ask me any questions because this is the first I’ve heard of it).