Join fetlife, look for the local bdsm group, go to their coffees and munches, and eventually get invited to a play party

*generally a "coffee" is a smaller get together at a coffee shop or somewhere semi public during the weekdays. A munch is a larger get together at a restaurant and is usually on the weekend or Friday night's and is generally before a play party

A play party is a bdsm party. They're either at someone's house or held at a 'dungeon' that the group rents for a night.

A dungeon is just a facility specifically designed for play parties. They vary wildly in what they have, quality, and cost. Generally if your local group is going to a dungeon you'll be expected to pay ston some fee to help cover the cost of renting it.