AsSalaamu '3alaykum Wara7matAllah Wabarakatuh,
I'm not sure of exactly what each one means, but before salah is commenced, the imam will say (along the lines) to straighten the sufoof (lines) that the musallis are standing in..he also says something else (I don't know the exact meaning to it in english unfortunately)..and this is from the sunnah to say this before leading salah...
I noticed they don't pray their salah with jama3ah when I was there, they just keep telling the women to go away from the main area right before salah starts. Maybe they're making sure the imam doesn't get bombarded with the public as soon as he's finished leading salah..possibly the reason why.