Set your event budget. This should be a top priority. Select your date and location. This could be as simple as planning to mow the back yard or may involve a visit to another city to view hotel and convention space. Remember that if you re having a luncheon for 200 people you need to consider serving space, space for a dais for your honored guests and whether you will need any audiovisual equipment.
Subtle lighting is nice for meal and social functions.
But if you are planning an all day workshop on accounting methods, you will want to make sure there is adequate lighting in the room. If you re having a birthday party in your home, just make sure you paid the bill and turn to the nearest outlet. But if you are planning a large convention, you need to consider what equipment will be in use that needs electricity. For example if you have exhibits, you need to know what access your vendors will require for their displays. This could be important for your exhibitors.