It is a good way to learn good partnering skills. So it doesn't matter if you come with a partner or alone. If not, don't worry. I don't have a partner, and I feel awkward coming to parties by myself. Not at all.
Most dancers arrive at parties by themselves.
This is how you get to meet other people who like to dance. Dancers come in all ages, abilities, sizes, and backgrounds. What they have in common is a love for dancing. And good dancers stand out, no matter their age, height or color. But that's my problem.