Yeah, JKR said in an interview that she thinks that Alice's name was either Prewitt or Williams but she didn't know because she didn't have her notebook with her. That was an interview for GMTV.But it wasn't put directly into the books so you can have any name you want.

You could have a ball as a valentines ball, or maybe the head students could decide to have a Sweethearts Dance?

Love the story by the way!