playing golf is what gets you in a place where you can be invited. Eventually 3 people will have a round planned - but a round is 4 people so they will take anyone who is able to play right then. If you can't play golf you are not invited - or if you say you do but can't you get black listed.

note that you need lots of other social skills to use this opportunity. They are playing a game and you are a side character - if you say too much you are out of line. However you can talk for 2 minutes (out of more than an hour long round) - use your minute well.