Re: mehndi on mehndi?
As far as my knowledge is concerned, mehndi on mehndi function doesn't have any theory behind it, it's just because some brides need to get their mehndi done from beauty saloons so they have to get it done in the morning (which is obviously before the function). I have seen some other cases like one of my friends had one day gap between her menhdi and barat functions so she didn't put mehndi on her hands on her menhdi celebration. So, I believe it depends on your convenience and time space.