Whether a party should be done at night or during the day depends on so many factors, but the most important one is you. Its your party and you can day or night if you want too. The next factor to consider is whether anyone will show up to what you like. I can give you a basic guidelines to help you make an informed decision. First factor is age, the young below 30 love late night events, while the older with families tend to lean on evening "the not to early and not to early I have things to do." Then you have the elderly they do not play after the sun goes down, so after or you will get a no show. If you are catering for children you are actually catering to their parents so Saturday or Sunday afternoon is like your only options. I hope that information is helpful when it comes time for you to make a decision.