Okay kiddo, so a Tweed Run is a really fun event where people dress up in fancy old-fashioned clothes from a long time ago. They wear things like tweed jackets, fancy hats, and sometimes even ride fancy old-fashioned bikes!
It's like a big party where people get together and ride bikes together, and everyone is dressed really nicely. It's called a "Tweed Run" because back in the old days, tweed was a really popular kind of fabric for clothes.
So now people dress up in tweed to kind of pretend like they're from that time period. It's not just about the clothes, though - it's also a chance for people to get together and have fun riding bikes around the city.
Sometimes, Tweed Runs even have games and challenges that people can do along the way. It's a really cool event that brings people together and celebrates style and fashion from a long time ago.