In the blues dance world, there's no particular step pattern, so you can just dance, with your partner, to the music. A lot of the music is slow and calm, and to that music we mostly dance slow and close. When the music gets more energetic we just follow it wherever it leads us. A lot of the music is blues, but it can also range pretty wide, whatever works for the way we want to dance.
With a little orientation you can start dancing tonight. You can dance in an easy and relaxed way, sharing the music and the moment with your partner, but you can also take it as far as you like, using whatever technique and vocabulary you may bring with you, along with a lot of stuff you can learn in the scene.