Stay calm and composed yet enthusiastic to welcome your guests. Look up names of children and or spouses of the invited guests ahead of time. Update phone numbers, emails and family info. Plan games and activities ahead of time, especially kids parties. Kids birthday parties can be enhanced by hiring clowns or acts.
Costume parties are also fun.
Have your guests dress up. It will be a great keep sake. Keep with the party theme. Write the Thank you notes before the party, with stamps. Fill in the details later.