If you expect dancing at your function, have a designated dancing area that has a hard, non-carpeted surface. The ideal dance floor is wood or tile. Cement is an alternative if there are no other options available.
Locate the DJ as near to the dance floor as possible. This provides better DJ/audience interaction and a greater control of the music volume.
Room acoustics can greatly affect sound distribution. The lower the ceiling and the denser the carpeting/draperies, the better the sound quality. Halls and spaces with very high ceilings and bare walls or floors tend to reverberate sounds and can make the music sound louder and “muddier” than what it actually is.
If possible, assign the younger guests to seating near the DJ’s setup. Your older guests will appreciate this accommodation.
Keep small children away from the DJ table and equipment.
Inform the DJ in advance of any activities that must start at an exact time.