Probably a very stupid question about Hasidic Jewish weddings?

I’m watching House, and at the reception after the ceremony, the females and males are separated by a wall, over which the bride and the groom hold each end of a cloth while being held up on the chairs.

I Googled it, and found all sorts of traditions, and the only separation mentioned is pre-ceremony. Is there some kind of tradition where the males and the females are separated for part of the reception? What does it symbolize?