Lights from outside creating soft shadows make for great photographs
If you can schedule at least 15 minutes of your portrait session to happen just before sunset, it will totally be worth it if the weather plays its part.
About 15 minutes into dusk, the soft, diffused light with a cool colour tone can result in good looking photos. Please follow the photographers instructions and make your movements faster, because it gets darker by the minute after this time.
If the sky is overcast, consider yourself lucky. As you can shoot all through the day, in this light without any fear, as the entire location is lit by soft, wrap around light.
For the reception and wedding indoors, natural, warm light is recommended. Mirchi lights or string lights can look great for the backdrops though.
DJ Night, Sangeet
For the dance floor, avoid red and orange colours, if possible. When there are multiple colours falling on the guests in the DJ night, be warned of really colour full photos in the end.
Harsh multi coloured LEDs in your Sangeet or dance evening is going to be unavoidable, but discuss with the lighting team to have breaks between numbers where normal lighting is restored for the photographers to have a go.
The photographer is in full control of his ISO, aperture and shutter speed; he can control the amount of light, direction, hardness and the temperature, but still, you may want to include them in your discussion with the lighting team.
This will mean better photos for you in the end.
As you very well know, a good photograph very much depends on lighting. There is natural lighting, artificial lighting and ambient lighting. These are based on the quality of available light in any situation.