it would be nice have some light qawwali's in the background during and after the food when photos r being taken,
If that's what you're looking for, then I'd recommend that you find qawwali CDs that you like and play those at your wedding. Generally speaking, its expected that the performers will be the center of attention at a live qawwali performance (especially considering the fact that this is technically religious music)...it will likely be seen as disrespectful half your guests are busy in the buffet lines etc.