Green’s Dictionary of Slang

meet n.

1. [mid-19C] (UK Und.) a meeting place.

2. [mid-19C+] (orig. US) a meeting, appointment, in 20C+ esp. for illicit purposes such as drug selling [now SE].

3. [20C+] (US) a gathering for the purpose of an activity, usu. sport, e.g. a swim meet, also a conference or convention.