10. Always Have a Backup Plan

Finally, have a backup plan. There are many factors that can cause heartache on the day of the party. The guest of honor can be sick or grumpy, more or less guests than expected can show up, an outside party could be rained out, the hired entertainment could not show up or the games you had planned can take less time to play and you're left with 15 five year-olds staring at you asking "What next or I'm bored" Think through the entire party and have a backup plan in place for every detail. If the party is outside, have an alternative venue. Have extra games in your arsenal to pull out if needed. Have more food than you expect to need; you can always send leftovers home with guests or give to a homeless shelter.