What is a car meet?

Ive playing playing for about a month and im still confused about what they are and I would really like to do one

You go in. Eventually (after a couple of minutes) you can set up a race, where everyone in the meet has the option to join (slower cars are given handicaps). You can also talk (I believe) and buy a car identical to someone else’s if you like it (unless it is DLC of course), complete with the design and tune.