Saturday is a great day for a kids party because there is no school and kids just can't wait to party.
Kids like cake and ice cream. They also like other kids to play with or to hang around with.
When they are kids they like people their own age to relate to.
So throw a party for them.
Do you remember not having enough parties for your self when you were younger?
Well then correct this problem by becoming the party maniac yourself and throw a party where you invite their friends and family.
It can be done cheaply enough so think about when and where and do it now - make the plan and call the kids to come.